diff --git a/src/cloud/components/Editor/index.tsx b/src/cloud/components/Editor/index.tsx
index 639530cb0a..b986116cb0 100644
--- a/src/cloud/components/Editor/index.tsx
+++ b/src/cloud/components/Editor/index.tsx
@@ -390,6 +390,13 @@ const Editor = ({
             ? fileUploadHandlerRef.current(file)
             : null
         },
+        onUnsupportedFile: () => {
+          pushMessage({
+            title: '',
+            description:
+              'Folder uploads are not supported. Please drop individual files instead.',
+          })
+        },
       })
       pasteFormatPlugin(editor, {
         openMenu: (pos, cb) => {
@@ -487,7 +494,7 @@ const Editor = ({
         )
       })
     },
-    [handleCursorShowHintActivity]
+    [handleCursorShowHintActivity, pushMessage]
   )
 
   const onTemplatePickCallback = useCallback(
diff --git a/src/cloud/lib/editor/plugins/fileHandler.spec.ts b/src/cloud/lib/editor/plugins/fileHandler.spec.ts
new file mode 100644
index 0000000000..50d352435b
--- /dev/null
+++ b/src/cloud/lib/editor/plugins/fileHandler.spec.ts
@@ -0,0 +1,23 @@
+import { isDirectoryTransferItem } from './fileHandler'
+
+describe('isDirectoryTransferItem', () => {
+  it('detects directory transfer items', () => {
+    const item = {
+      webkitGetAsEntry: () => ({ isDirectory: true }),
+    } as DataTransferItem
+
+    expect(isDirectoryTransferItem(item)).toBe(true)
+  })
+
+  it('ignores file transfer items', () => {
+    const item = {
+      webkitGetAsEntry: () => ({ isDirectory: false }),
+    } as DataTransferItem
+
+    expect(isDirectoryTransferItem(item)).toBe(false)
+  })
+
+  it('ignores transfer items without entry support', () => {
+    expect(isDirectoryTransferItem({} as DataTransferItem)).toBe(false)
+  })
+})
diff --git a/src/cloud/lib/editor/plugins/fileHandler.ts b/src/cloud/lib/editor/plugins/fileHandler.ts
index 63812c1367..d2ae1bce61 100644
--- a/src/cloud/lib/editor/plugins/fileHandler.ts
+++ b/src/cloud/lib/editor/plugins/fileHandler.ts
@@ -1,6 +1,10 @@
 import { boostHubBaseUrl } from '../../consts'
 
 export type OnFileCallback = (file: File) => Promise<FileNode | null>
+export type OnUnsupportedFileCallback = (
+  file: File,
+  reason: 'directory'
+) => void
 
 type FileNode =
   | { type: 'img'; url: string; alt?: string; title?: string }
@@ -8,14 +12,31 @@ type FileNode =
 
 interface FileHandlerConfig {
   onFile: OnFileCallback
+  onUnsupportedFile?: OnUnsupportedFileCallback
   buildWidget?: (file: File) => HTMLElement
   lineClass?: string
 }
 
+interface DataTransferItemEntryLike {
+  webkitGetAsEntry?: () => {
+    isDirectory: boolean
+  } | null
+}
+
+export const isDirectoryTransferItem = (item: DataTransferItem | undefined) => {
+  if (item == null) {
+    return false
+  }
+
+  const entry = (item as DataTransferItemEntryLike).webkitGetAsEntry?.()
+  return entry != null && entry.isDirectory
+}
+
 const attachFileHandlerToCodeMirrorEditor = (
   editor: CodeMirror.Editor,
   {
     onFile,
+    onUnsupportedFile,
     buildWidget = buildDefaultUploadWidget,
     lineClass = 'file-loading',
   }: FileHandlerConfig
@@ -49,6 +70,10 @@ const attachFileHandlerToCodeMirrorEditor = (
       const pos = instance.coordsChar({ left: event.pageX, top: event.pageY })
       const files = event.dataTransfer.files
       for (let i = 0; i < files.length; i++) {
+        if (isDirectoryTransferItem(event.dataTransfer.items[i])) {
+          onUnsupportedFile?.(files[i], 'directory')
+          continue
+        }
         await handler(i > 0 ? instance.getCursor() : pos, files[i])
       }
     }