diff --git a/lib/core/src/lib/form/services/form.service.ts b/lib/core/src/lib/form/services/form.service.ts
index 5505fb7ec49..184797bad9a 100644
--- a/lib/core/src/lib/form/services/form.service.ts
+++ b/lib/core/src/lib/form/services/form.service.ts
@@ -83,4 +83,8 @@ export class FormService implements FormValidationService {
         }
         return null;
     }
+
+    getPreviewState(): boolean {
+        return false;
+    }
 }
diff --git a/lib/core/src/lib/i18n/en.json b/lib/core/src/lib/i18n/en.json
index 31a74009600..50ca7aa8999 100644
--- a/lib/core/src/lib/i18n/en.json
+++ b/lib/core/src/lib/i18n/en.json
@@ -35,7 +35,10 @@
       "TITLE": "Start Form"
     },
     "PREVIEW": {
-      "IMAGE_NOT_AVAILABLE": "Preview not available"
+      "IMAGE_NOT_AVAILABLE": "Preview not available",
+      "ATTACH_FILE_WIDGET": {
+        "ON_ATTACH_FILE_CLICK": "In preview mode you cannot attach a file"
+      }
     },
     "FIELD": {
       "LOCALSTORAGE": "Local storage",
diff --git a/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.spec.ts b/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.spec.ts
index 5ea0dbe8c2c..39426bee037 100644
--- a/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.spec.ts
+++ b/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.spec.ts
@@ -154,6 +154,7 @@ describe('AttachFileCloudWidgetComponent', () => {
             imports: [TranslateModule.forRoot(), ProcessServiceCloudTestingModule, FormCloudModule, ContentModule.forRoot()],
             schemas: [CUSTOM_ELEMENTS_SCHEMA]
         });
+        notificationService = TestBed.inject(NotificationService);
         downloadService = TestBed.inject(DownloadService);
         fixture = TestBed.createComponent(AttachFileCloudWidgetComponent);
         widget = fixture.componentInstance;
@@ -241,6 +242,17 @@ describe('AttachFileCloudWidgetComponent', () => {
         expect(contentNodeSelectorPanelService.customModels).toEqual([]);
     });
 
+    it('should display warning message when is in preview state', () => {
+        spyOn(notificationService, 'showWarning');
+        spyOn(formService, 'getPreviewState').and.returnValue(true);
+        createUploadWidgetField(new FormModel(), 'attach-file-alfresco', [], contentSourceParam);
+        fixture.detectChanges();
+
+        clickOnAttachFileWidget('attach-file-alfresco');
+
+        expect(notificationService.showWarning).toHaveBeenCalledWith('FORM.PREVIEW.ATTACH_FILE_WIDGET.ON_ATTACH_FILE_CLICK');
+    });
+
     describe('when is required', () => {
         it('should be able to display label with asterisk', async () => {
             widget.field = new FormFieldModel(new FormModel({ taskId: '<id>' }), {
@@ -874,7 +886,6 @@ describe('AttachFileCloudWidgetComponent', () => {
         let spyOnShowError: jasmine.Spy;
 
         beforeEach(() => {
-            notificationService = TestBed.inject(NotificationService);
             newVersionUploaderService = TestBed.inject(NewVersionUploaderService);
             spyOnOpenUploadNewVersionDialog = spyOn(newVersionUploaderService, 'openUploadNewVersionDialog').and.returnValue(
                 of({ action: NewVersionUploaderDataAction.refresh } as any)
diff --git a/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.ts b/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.ts
index 6e1a26c4f74..63e2541b672 100644
--- a/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.ts
+++ b/lib/process-services-cloud/src/lib/form/components/widgets/attach-file/attach-file-cloud-widget.component.ts
@@ -65,6 +65,7 @@ export class AttachFileCloudWidgetComponent extends UploadCloudWidgetComponent i
     rootNodeId = ALIAS_USER_FOLDER;
     selectedNode: Node;
 
+    private previewState = false;
     private _nodesApi: NodesApi;
     get nodesApi(): NodesApi {
         this._nodesApi = this._nodesApi ?? new NodesApi(this.apiService.getInstance());
@@ -95,6 +96,7 @@ export class AttachFileCloudWidgetComponent extends UploadCloudWidgetComponent i
         }
         this.field.params.displayableCMProperties = this.field.params.displayableCMProperties ?? [];
         this.displayedColumns.splice(2, 0, ...(this.field.params.displayableCMProperties?.map(property => property?.name) || []));
+        this.setPreviewState();
     }
 
     isPathStaticType(): boolean {
@@ -126,22 +128,26 @@ export class AttachFileCloudWidgetComponent extends UploadCloudWidgetComponent i
     }
 
     async openSelectDialog() {
-        const selectedMode = this.field.params.multiple ? 'multiple' : 'single';
-        const nodeId = await this.getDestinationFolderNodeId();
-        this.rootNodeId = nodeId ? nodeId : ALIAS_USER_FOLDER;
-        this.contentNodeSelectorPanelService.customModels = this.field.params.customModels;
-
-        this.contentNodeSelectorService
-            .openUploadFileDialog(this.rootNodeId, selectedMode, this.isAlfrescoAndLocal(), true)
-            .subscribe((selections: Node[]) => {
-                selections.forEach(node => (node['isExternal'] = true));
-                const selectionWithoutDuplication = this.removeExistingSelection(selections);
-                const hadFilesAttached = this.field.value?.length > 0;
-                this.fixIncompatibilityFromPreviousAndNewForm(selectionWithoutDuplication);
-                if(!hadFilesAttached) {
-                    this.contentModelFormFileHandler(this.field.value.length > 0 ? this.field.value[0] : null);
-                }
-            });
+        if (this.previewState) {
+            this.notificationService.showWarning('FORM.PREVIEW.ATTACH_FILE_WIDGET.ON_ATTACH_FILE_CLICK');
+        } else {
+            const selectedMode = this.field.params.multiple ? 'multiple' : 'single';
+            const nodeId = await this.getDestinationFolderNodeId();
+            this.rootNodeId = nodeId ? nodeId : ALIAS_USER_FOLDER;
+            this.contentNodeSelectorPanelService.customModels = this.field.params.customModels;
+
+            this.contentNodeSelectorService
+                .openUploadFileDialog(this.rootNodeId, selectedMode, this.isAlfrescoAndLocal(), true)
+                .subscribe((selections: Node[]) => {
+                    selections.forEach(node => (node['isExternal'] = true));
+                    const selectionWithoutDuplication = this.removeExistingSelection(selections);
+                    const hadFilesAttached = this.field.value?.length > 0;
+                    this.fixIncompatibilityFromPreviousAndNewForm(selectionWithoutDuplication);
+                    if (!hadFilesAttached) {
+                        this.contentModelFormFileHandler(this.field.value.length > 0 ? this.field.value[0] : null);
+                    }
+                });
+        }
     }
 
     private async getDestinationFolderNodeId(): Promise<string> {
@@ -274,4 +280,8 @@ export class AttachFileCloudWidgetComponent extends UploadCloudWidgetComponent i
     ngOnDestroy() {
         this.contentNodeSelectorPanelService.customModels = [];
     }
+
+    private setPreviewState(): void {
+        this.previewState = this.formService.getPreviewState();
+    }
 }