Markdown: ImageUploadChanged with multiple files fix

Documentation/Blazorise.Docs/Pages/Docs/Extensions/Markdown/MarkdownPage.razor

@@ -58,7 +58,9 @@
 
 <DocsPageSection>
     <DocsPageSectionHeader Title="Upload image">
-        Uploading image has a similar API to our FileEdit component and it is fairly simple to do.
+        Uploading an image has a similar API to our <Code>FileEdit</Code> component and is fairly simple to use.
+        <Strong>Note that</Strong> the events related to file uploads fire separately for each file instead of grouping them.
+        This behavior comes from the underlying Easy Markdown Editor, which processes files individually.
     </DocsPageSectionHeader>
     <DocsPageSectionContent Outlined FullWidth>
         <MarkdownUploadImageExample />

Source/Extensions/Blazorise.Markdown/wwwroot/markdown.js

@@ -80,7 +80,9 @@ export function initialize(dotNetObjectRef, element, elementId, options) {
             imageUploadNotifier.onError = onError;
 
             // Reduce to purely serializable data, plus build an index by ID
-            element._blazorFilesById = {};
+            if (element._blazorFilesById == null) {
+                element._blazorFilesById = {};
+            }
 
             var fileEntry = {
                 id: ++nextFileId,