diff --git a/src/CONST.ts b/src/CONST.ts
index 50df9118a74e..c34fd5a8b31a 100755
--- a/src/CONST.ts
+++ b/src/CONST.ts
@@ -1203,6 +1203,8 @@ const CONST = {
         NOTE: 'n',
     },
 
+    IMAGE_HIGH_RESOLUTION_THRESHOLD: 7000,
+
     IMAGE_OBJECT_POSITION: {
         TOP: 'top',
         INITIAL: 'initial',
diff --git a/src/components/AttachmentModal.tsx b/src/components/AttachmentModal.tsx
index 368347847890..b6ea09f32436 100644
--- a/src/components/AttachmentModal.tsx
+++ b/src/components/AttachmentModal.tsx
@@ -529,6 +529,7 @@ function AttachmentModal({
                                             fallbackSource={fallbackSource}
                                             isUsedInAttachmentModal
                                             transactionID={transaction?.transactionID}
+                                            isUploaded={!isEmptyObject(report)}
                                         />
                                     </AttachmentCarouselPagerContext.Provider>
                                 )
diff --git a/src/components/Attachments/AttachmentCarousel/CarouselItem.tsx b/src/components/Attachments/AttachmentCarousel/CarouselItem.tsx
index 2ec1883fd7de..a9b5dfb7feb6 100644
--- a/src/components/Attachments/AttachmentCarousel/CarouselItem.tsx
+++ b/src/components/Attachments/AttachmentCarousel/CarouselItem.tsx
@@ -74,6 +74,7 @@ function CarouselItem({item, onPress, isFocused, isModalHovered}: CarouselItemPr
             <View style={[styles.imageModalImageCenterContainer]}>
                 <AttachmentView
                     source={item.source}
+                    previewSource={item.previewSource}
                     file={item.file}
                     isAuthTokenRequired={item.isAuthTokenRequired}
                     onPress={onPress}
diff --git a/src/components/Attachments/AttachmentCarousel/Pager/AttachmentCarouselPagerContext.ts b/src/components/Attachments/AttachmentCarousel/Pager/AttachmentCarouselPagerContext.ts
index 5893bcd9936e..af7953eab5be 100644
--- a/src/components/Attachments/AttachmentCarousel/Pager/AttachmentCarouselPagerContext.ts
+++ b/src/components/Attachments/AttachmentCarousel/Pager/AttachmentCarouselPagerContext.ts
@@ -10,6 +10,9 @@ type AttachmentCarouselPagerItems = {
     /** The source of the image is used to identify each attachment/page in the pager */
     source: AttachmentSource;
 
+    /** URL to preview-sized attachment that is also used for the thumbnail */
+    previewSource?: AttachmentSource;
+
     /** The index of the pager item determines the order of the images in the pager */
     index: number;
 
diff --git a/src/components/Attachments/AttachmentCarousel/Pager/index.tsx b/src/components/Attachments/AttachmentCarousel/Pager/index.tsx
index c32919ecff6e..0b6b67b38110 100644
--- a/src/components/Attachments/AttachmentCarousel/Pager/index.tsx
+++ b/src/components/Attachments/AttachmentCarousel/Pager/index.tsx
@@ -77,7 +77,10 @@ function AttachmentCarouselPager(
     }, [activePage, initialPage]);
 
     /** The `pagerItems` object that passed down to the context. Later used to detect current page, whether it's a single image gallery etc. */
-    const pagerItems = useMemo(() => items.map((item, index) => ({source: item.source, index, isActive: index === activePageIndex})), [activePageIndex, items]);
+    const pagerItems = useMemo(
+        () => items.map((item, index) => ({source: item.source, previewSource: item.previewSource, index, isActive: index === activePageIndex})),
+        [activePageIndex, items],
+    );
 
     const extractItemKey = useCallback(
         (item: Attachment, index: number) =>
diff --git a/src/components/Attachments/AttachmentCarousel/extractAttachments.ts b/src/components/Attachments/AttachmentCarousel/extractAttachments.ts
index 1e9c67cf84ac..40438d47ecc7 100644
--- a/src/components/Attachments/AttachmentCarousel/extractAttachments.ts
+++ b/src/components/Attachments/AttachmentCarousel/extractAttachments.ts
@@ -52,6 +52,7 @@ function extractAttachments(
             if (name === 'img' && attribs.src) {
                 const expensifySource = attribs[CONST.ATTACHMENT_SOURCE_ATTRIBUTE];
                 const source = tryResolveUrlFromApiRoot(expensifySource || attribs.src);
+                const previewSource = tryResolveUrlFromApiRoot(attribs.src);
                 if (uniqueSources.has(source)) {
                     return;
                 }
@@ -59,6 +60,9 @@ function extractAttachments(
                 uniqueSources.add(source);
                 let fileName = attribs[CONST.ATTACHMENT_ORIGINAL_FILENAME_ATTRIBUTE] || FileUtils.getFileName(`${source}`);
 
+                const width = (attribs['data-expensify-width'] && parseInt(attribs['data-expensify-width'], 10)) || undefined;
+                const height = (attribs['data-expensify-height'] && parseInt(attribs['data-expensify-height'], 10)) || undefined;
+
                 // Public image URLs might lack a file extension in the source URL, without an extension our
                 // AttachmentView fails to recognize them as images and renders fallback content instead.
                 // We apply this small hack to add an image extension and ensure AttachmentView renders the image.
@@ -72,8 +76,9 @@ function extractAttachments(
                 attachments.unshift({
                     reportActionID: attribs['data-id'],
                     source,
+                    previewSource,
                     isAuthTokenRequired: !!expensifySource,
-                    file: {name: fileName},
+                    file: {name: fileName, width, height},
                     isReceipt: false,
                     hasBeenFlagged: attribs['data-flagged'] === 'true',
                 });
diff --git a/src/components/Attachments/AttachmentView/DefaultAttachmentView/index.tsx b/src/components/Attachments/AttachmentView/DefaultAttachmentView/index.tsx
index e06ea3064150..ee594f66aabc 100644
--- a/src/components/Attachments/AttachmentView/DefaultAttachmentView/index.tsx
+++ b/src/components/Attachments/AttachmentView/DefaultAttachmentView/index.tsx
@@ -8,6 +8,7 @@ import Tooltip from '@components/Tooltip';
 import useLocalize from '@hooks/useLocalize';
 import useTheme from '@hooks/useTheme';
 import useThemeStyles from '@hooks/useThemeStyles';
+import type IconAsset from '@src/types/utils/IconAsset';
 
 type DefaultAttachmentViewProps = {
     /** The name of the file */
@@ -21,9 +22,11 @@ type DefaultAttachmentViewProps = {
 
     /** Additional styles for the container */
     containerStyles?: StyleProp<ViewStyle>;
+
+    icon?: IconAsset;
 };
 
-function DefaultAttachmentView({fileName = '', shouldShowLoadingSpinnerIcon = false, shouldShowDownloadIcon, containerStyles}: DefaultAttachmentViewProps) {
+function DefaultAttachmentView({fileName = '', shouldShowLoadingSpinnerIcon = false, shouldShowDownloadIcon, containerStyles, icon}: DefaultAttachmentViewProps) {
     const theme = useTheme();
     const styles = useThemeStyles();
     const {translate} = useLocalize();
@@ -33,7 +36,7 @@ function DefaultAttachmentView({fileName = '', shouldShowLoadingSpinnerIcon = fa
             <View style={styles.mr2}>
                 <Icon
                     fill={theme.icon}
-                    src={Expensicons.Paperclip}
+                    src={icon ?? Expensicons.Paperclip}
                 />
             </View>
 
diff --git a/src/components/Attachments/AttachmentView/HighResolutionInfo.tsx b/src/components/Attachments/AttachmentView/HighResolutionInfo.tsx
new file mode 100644
index 000000000000..7ea3c83aa96f
--- /dev/null
+++ b/src/components/Attachments/AttachmentView/HighResolutionInfo.tsx
@@ -0,0 +1,32 @@
+import React from 'react';
+import {View} from 'react-native';
+import Icon from '@components/Icon';
+import * as Expensicons from '@components/Icon/Expensicons';
+import Text from '@components/Text';
+import useLocalize from '@hooks/useLocalize';
+import useStyleUtils from '@hooks/useStyleUtils';
+import useTheme from '@hooks/useTheme';
+import useThemeStyles from '@hooks/useThemeStyles';
+import variables from '@styles/variables';
+
+function HighResolutionInfo({isUploaded}: {isUploaded: boolean}) {
+    const theme = useTheme();
+    const styles = useThemeStyles();
+    const stylesUtils = useStyleUtils();
+    const {translate} = useLocalize();
+
+    return (
+        <View style={[styles.flexRow, styles.alignItemsCenter, styles.gap2, styles.justifyContentCenter, stylesUtils.getHighResolutionInfoWrapperStyle(isUploaded)]}>
+            <Icon
+                src={Expensicons.Info}
+                height={variables.iconSizeExtraSmall}
+                width={variables.iconSizeExtraSmall}
+                fill={theme.icon}
+                additionalStyles={styles.p1}
+            />
+            <Text style={[styles.textLabelSupporting]}>{isUploaded ? translate('attachmentPicker.attachmentImageResized') : translate('attachmentPicker.attachmentImageTooLarge')}</Text>
+        </View>
+    );
+}
+
+export default HighResolutionInfo;
diff --git a/src/components/Attachments/AttachmentView/index.tsx b/src/components/Attachments/AttachmentView/index.tsx
index a7409e57f846..39c25706bbfe 100644
--- a/src/components/Attachments/AttachmentView/index.tsx
+++ b/src/components/Attachments/AttachmentView/index.tsx
@@ -8,6 +8,7 @@ import type {Attachment, AttachmentSource} from '@components/Attachments/types';
 import DistanceEReceipt from '@components/DistanceEReceipt';
 import EReceipt from '@components/EReceipt';
 import Icon from '@components/Icon';
+import * as Expensicons from '@components/Icon/Expensicons';
 import ScrollView from '@components/ScrollView';
 import {usePlaybackContext} from '@components/VideoPlayerContexts/PlaybackContext';
 import useLocalize from '@hooks/useLocalize';
@@ -17,6 +18,7 @@ import useTheme from '@hooks/useTheme';
 import useThemeStyles from '@hooks/useThemeStyles';
 import * as CachedPDFPaths from '@libs/actions/CachedPDFPaths';
 import addEncryptedAuthTokenToURL from '@libs/addEncryptedAuthTokenToURL';
+import * as FileUtils from '@libs/fileDownload/FileUtils';
 import * as TransactionUtils from '@libs/TransactionUtils';
 import type {ColorValue} from '@styles/utils/types';
 import variables from '@styles/variables';
@@ -26,6 +28,7 @@ import AttachmentViewImage from './AttachmentViewImage';
 import AttachmentViewPdf from './AttachmentViewPdf';
 import AttachmentViewVideo from './AttachmentViewVideo';
 import DefaultAttachmentView from './DefaultAttachmentView';
+import HighResolutionInfo from './HighResolutionInfo';
 
 type AttachmentViewOnyxProps = {
     transaction: OnyxEntry<Transaction>;
@@ -70,10 +73,14 @@ type AttachmentViewProps = AttachmentViewOnyxProps &
 
         /** Whether the attachment is used as a chat attachment */
         isUsedAsChatAttachment?: boolean;
+
+        /* Flag indicating whether the attachment has been uploaded. */
+        isUploaded?: boolean;
     };
 
 function AttachmentView({
     source,
+    previewSource,
     file,
     isAuthTokenRequired,
     onPress,
@@ -92,6 +99,7 @@ function AttachmentView({
     isHovered,
     duration,
     isUsedAsChatAttachment,
+    isUploaded = true,
 }: AttachmentViewProps) {
     const {translate} = useLocalize();
     const {updateCurrentlyPlayingURL} = usePlaybackContext();
@@ -99,6 +107,7 @@ function AttachmentView({
     const styles = useThemeStyles();
     const StyleUtils = useStyleUtils();
     const [loadComplete, setLoadComplete] = useState(false);
+    const [isHighResolution, setIsHighResolution] = useState<boolean>(false);
     const [hasPDFFailedToLoad, setHasPDFFailedToLoad] = useState(false);
     const isVideo = (typeof source === 'string' && Str.isVideo(source)) || (file?.name && Str.isVideo(file.name));
 
@@ -113,6 +122,12 @@ function AttachmentView({
 
     useNetwork({onReconnect: () => setImageError(false)});
 
+    useEffect(() => {
+        FileUtils.getFileResolution(file).then((resolution) => {
+            setIsHighResolution(FileUtils.isHighResolutionImage(resolution));
+        });
+    }, [file]);
+
     // Handles case where source is a component (ex: SVG) or a number
     // Number may represent a SVG or an image
     if (typeof source === 'function' || (maybeIcon && typeof source === 'number')) {
@@ -196,35 +211,61 @@ function AttachmentView({
     // For this check we use both source and file.name since temporary file source is a blob
     // both PDFs and images will appear as images when pasted into the text field.
     // We also check for numeric source since this is how static images (used for preview) are represented in RN.
-    const isImage = typeof source === 'number' || (typeof source === 'string' && Str.isImage(source));
-    if (isImage || (file?.name && Str.isImage(file.name))) {
-        if (imageError) {
-            // AttachmentViewImage can't handle icon fallbacks, so we need to handle it here
-            if (typeof fallbackSource === 'number' || typeof fallbackSource === 'function') {
+    const isSourceImage = typeof source === 'number' || (typeof source === 'string' && Str.isImage(source));
+    const isFileNameImage = file?.name && Str.isImage(file.name);
+    const isFileImage = isSourceImage || isFileNameImage;
+
+    if (isFileImage) {
+        if (imageError && (typeof fallbackSource === 'number' || typeof fallbackSource === 'function')) {
+            return (
+                <Icon
+                    src={fallbackSource}
+                    height={variables.defaultAvatarPreviewSize}
+                    width={variables.defaultAvatarPreviewSize}
+                    additionalStyles={[styles.alignItemsCenter, styles.justifyContentCenter, styles.flex1]}
+                    fill={theme.border}
+                />
+            );
+        }
+        let imageSource = imageError && fallbackSource ? (fallbackSource as string) : (source as string);
+
+        if (isHighResolution) {
+            if (!isUploaded) {
                 return (
-                    <Icon
-                        src={fallbackSource}
-                        height={variables.defaultAvatarPreviewSize}
-                        width={variables.defaultAvatarPreviewSize}
-                        additionalStyles={[styles.alignItemsCenter, styles.justifyContentCenter, styles.flex1]}
-                        fill={theme.border}
-                    />
+                    <>
+                        <View style={styles.imageModalImageCenterContainer}>
+                            <DefaultAttachmentView
+                                icon={Expensicons.Gallery}
+                                fileName={file?.name}
+                                shouldShowDownloadIcon={shouldShowDownloadIcon}
+                                shouldShowLoadingSpinnerIcon={shouldShowLoadingSpinnerIcon}
+                                containerStyles={containerStyles}
+                            />
+                        </View>
+                        <HighResolutionInfo isUploaded={isUploaded} />
+                    </>
                 );
             }
+            imageSource = previewSource?.toString() ?? imageSource;
         }
 
         return (
-            <AttachmentViewImage
-                url={imageError && fallbackSource ? (fallbackSource as string) : (source as string)}
-                file={file}
-                isAuthTokenRequired={isAuthTokenRequired}
-                loadComplete={loadComplete}
-                isImage={isImage}
-                onPress={onPress}
-                onError={() => {
-                    setImageError(true);
-                }}
-            />
+            <>
+                <View style={styles.imageModalImageCenterContainer}>
+                    <AttachmentViewImage
+                        url={imageSource}
+                        file={file}
+                        isAuthTokenRequired={isAuthTokenRequired}
+                        loadComplete={loadComplete}
+                        isImage={isFileImage}
+                        onPress={onPress}
+                        onError={() => {
+                            setImageError(true);
+                        }}
+                    />
+                </View>
+                {isHighResolution && <HighResolutionInfo isUploaded={isUploaded} />}
+            </>
         );
     }
 
diff --git a/src/components/Attachments/types.ts b/src/components/Attachments/types.ts
index 835482ca99d9..8bac4cc53af6 100644
--- a/src/components/Attachments/types.ts
+++ b/src/components/Attachments/types.ts
@@ -13,6 +13,9 @@ type Attachment = {
     /** URL to full-sized attachment, SVG function, or numeric static image on native platforms */
     source: AttachmentSource;
 
+    /** URL to preview-sized attachment that is also used for the thumbnail */
+    previewSource?: AttachmentSource;
+
     /** File object can be an instance of File or Object */
     file?: FileObject;
 
diff --git a/src/components/Lightbox/index.tsx b/src/components/Lightbox/index.tsx
index ea10e104a59d..c5a77f9d5ec4 100644
--- a/src/components/Lightbox/index.tsx
+++ b/src/components/Lightbox/index.tsx
@@ -78,7 +78,7 @@ function Lightbox({isAuthTokenRequired = false, uri, onScaleChanged: onScaleChan
             };
         }
 
-        const foundPage = attachmentCarouselPagerContext.pagerItems.findIndex((item) => item.source === uri);
+        const foundPage = attachmentCarouselPagerContext.pagerItems.findIndex((item) => item.source === uri || item.previewSource === uri);
         return {
             ...attachmentCarouselPagerContext,
             isUsedInCarousel: !!attachmentCarouselPagerContext.pagerRef,
diff --git a/src/languages/en.ts b/src/languages/en.ts
index c7b5125d02fa..d5b43aab302f 100755
--- a/src/languages/en.ts
+++ b/src/languages/en.ts
@@ -391,6 +391,8 @@ export default {
         notAllowedExtension: 'This file type is not allowed. Please try a different file type.',
         folderNotAllowedMessage: 'Uploading a folder is not allowed. Please try a different file.',
         protectedPDFNotSupported: 'Password-protected PDF is not supported',
+        attachmentImageResized: 'This image has been resized for previewing. Download for full resolution.',
+        attachmentImageTooLarge: 'This image is too large to preview before uploading.',
     },
     connectionComplete: {
         title: 'Connection complete',
diff --git a/src/languages/es.ts b/src/languages/es.ts
index 075903d0f324..a62f9531ac60 100644
--- a/src/languages/es.ts
+++ b/src/languages/es.ts
@@ -385,6 +385,8 @@ export default {
         notAllowedExtension: 'Este tipo de archivo no es compatible',
         folderNotAllowedMessage: 'Subir una carpeta no está permitido. Prueba con otro archivo.',
         protectedPDFNotSupported: 'Los PDFs con contraseña no son compatibles',
+        attachmentImageResized: 'Se ha cambiado el tamaño de esta imagen para obtener una vista previa. Descargar para resolución completa.',
+        attachmentImageTooLarge: 'Esta imagen es demasiado grande para obtener una vista previa antes de subirla.',
     },
     avatarCropModal: {
         title: 'Editar foto',
diff --git a/src/libs/fileDownload/FileUtils.ts b/src/libs/fileDownload/FileUtils.ts
index dab7e8e33a6d..7422d8bd8d8b 100644
--- a/src/libs/fileDownload/FileUtils.ts
+++ b/src/libs/fileDownload/FileUtils.ts
@@ -6,6 +6,7 @@ import DateUtils from '@libs/DateUtils';
 import * as Localize from '@libs/Localize';
 import Log from '@libs/Log';
 import CONST from '@src/CONST';
+import getImageResolution from './getImageResolution';
 import type {ReadFileAsync, SplitExtensionFromFileName} from './types';
 
 /**
@@ -261,6 +262,29 @@ function isLocalFile(receiptUri?: string | number): boolean {
     return typeof receiptUri === 'number' || receiptUri?.startsWith('blob:') || receiptUri?.startsWith('file:') || receiptUri?.startsWith('/');
 }
 
+function getFileResolution(targetFile: FileObject | undefined): Promise<{width: number; height: number} | null> {
+    if (!targetFile) {
+        return Promise.resolve(null);
+    }
+
+    // If the file already has width and height, return them directly
+    if ('width' in targetFile && 'height' in targetFile) {
+        return Promise.resolve({width: targetFile.width ?? 0, height: targetFile.height ?? 0});
+    }
+
+    // Otherwise, attempt to get the image resolution
+    return getImageResolution(targetFile)
+        .then(({width, height}) => ({width, height}))
+        .catch((error: Error) => {
+            Log.hmmm('Failed to get image resolution:', error);
+            return null;
+        });
+}
+
+function isHighResolutionImage(resolution: {width: number; height: number} | null): boolean {
+    return resolution !== null && (resolution.width > CONST.IMAGE_HIGH_RESOLUTION_THRESHOLD || resolution.height > CONST.IMAGE_HIGH_RESOLUTION_THRESHOLD);
+}
+
 export {
     showGeneralErrorAlert,
     showSuccessAlert,
@@ -275,4 +299,7 @@ export {
     base64ToFile,
     isLocalFile,
     validateImageForCorruption,
+    isImage,
+    getFileResolution,
+    isHighResolutionImage,
 };
diff --git a/src/styles/utils/getHighResolutionInfoWrapperStyle/index.native.ts b/src/styles/utils/getHighResolutionInfoWrapperStyle/index.native.ts
new file mode 100644
index 000000000000..743c52287486
--- /dev/null
+++ b/src/styles/utils/getHighResolutionInfoWrapperStyle/index.native.ts
@@ -0,0 +1,11 @@
+// eslint-disable-next-line no-restricted-imports
+import spacing from '@styles/utils/spacing';
+import type GetHighResolutionInfoWrapperStyle from './types';
+
+const getHighResolutionInfoWrapperStyle: GetHighResolutionInfoWrapperStyle = (isUploaded) => ({
+    ...spacing.ph8,
+    ...spacing.pt5,
+    ...(isUploaded ? spacing.pb5 : spacing.mbn1),
+});
+
+export default getHighResolutionInfoWrapperStyle;
diff --git a/src/styles/utils/getHighResolutionInfoWrapperStyle/index.ts b/src/styles/utils/getHighResolutionInfoWrapperStyle/index.ts
new file mode 100644
index 000000000000..ff10f7c71420
--- /dev/null
+++ b/src/styles/utils/getHighResolutionInfoWrapperStyle/index.ts
@@ -0,0 +1,11 @@
+// eslint-disable-next-line no-restricted-imports
+import spacing from '@styles/utils/spacing';
+import type GetHighResolutionInfoWrapperStyle from './types';
+
+const getHighResolutionInfoWrapperStyle: GetHighResolutionInfoWrapperStyle = (isUploaded) => ({
+    ...spacing.ph5,
+    ...spacing.pt5,
+    ...(isUploaded ? spacing.pb5 : spacing.mbn1),
+});
+
+export default getHighResolutionInfoWrapperStyle;
diff --git a/src/styles/utils/getHighResolutionInfoWrapperStyle/types.ts b/src/styles/utils/getHighResolutionInfoWrapperStyle/types.ts
new file mode 100644
index 000000000000..b7ff33d7c071
--- /dev/null
+++ b/src/styles/utils/getHighResolutionInfoWrapperStyle/types.ts
@@ -0,0 +1,5 @@
+import type {ViewStyle} from 'react-native';
+
+type GetHighResolutionInfoWrapperStyle = (isUploaded: boolean) => ViewStyle;
+
+export default GetHighResolutionInfoWrapperStyle;
diff --git a/src/styles/utils/index.ts b/src/styles/utils/index.ts
index 09df150df0ed..c7fe153857e7 100644
--- a/src/styles/utils/index.ts
+++ b/src/styles/utils/index.ts
@@ -23,6 +23,7 @@ import createModalStyleUtils from './generators/ModalStyleUtils';
 import createReportActionContextMenuStyleUtils from './generators/ReportActionContextMenuStyleUtils';
 import createTooltipStyleUtils from './generators/TooltipStyleUtils';
 import getContextMenuItemStyles from './getContextMenuItemStyles';
+import getHighResolutionInfoWrapperStyle from './getHighResolutionInfoWrapperStyle';
 import getNavigationModalCardStyle from './getNavigationModalCardStyles';
 import getSignInBgStyles from './getSignInBgStyles';
 import {compactContentContainerStyles} from './optionRowStyles';
@@ -1182,6 +1183,7 @@ const staticStyleUtils = {
     getCharacterWidth,
     getAmountWidth,
     getBorderRadiusStyle,
+    getHighResolutionInfoWrapperStyle,
 };
 
 const createStyleUtils = (theme: ThemeColors, styles: ThemeStyles) => ({