diff --git a/addons/mail/static/src/component_hooks/use_drag_visible_dropzone/use_drag_visible_dropzone.js b/addons/mail/static/src/component_hooks/use_drag_visible_dropzone/use_drag_visible_dropzone.js
index ada2eb3f425..86694083fce 100644
--- a/addons/mail/static/src/component_hooks/use_drag_visible_dropzone/use_drag_visible_dropzone.js
+++ b/addons/mail/static/src/component_hooks/use_drag_visible_dropzone/use_drag_visible_dropzone.js
@@ -62,7 +62,11 @@ export function useDragVisibleDropZone() {
      * @param {DragEvent} ev
      */
     function _onDragenterListener(ev) {
-        if (dragCount === 0) {
+        if (
+            dragCount === 0 &&
+            ev.dataTransfer &&
+            ev.dataTransfer.types.includes('Files')
+        ) {
             isVisible.value = true;
         }
         dragCount++;