Mendix File Uploader – Drag & Drop Not Working in Microsoft Edge (Works in Chrome)

[SiemensBleuler]

The Mendix File Uploader widget (from the File Uploader Module) no longer supports Drag & Drop in Microsoft Edge, although it still works normally in Google Chrome.

We are unsure whether it is only affecting our Edge setup at our company or if it is a general issue with the latest release of edge.
Edge Version Version 144.0.3719.92 (Offizielles Build) (64-Bit)
File Uploader Version 2.4.0

This issue affects all our Mendix applications across environments.
Details

Drag & Drop triggers no reaction in Edge.
No error message is shown in the Mendix UI.
Double‑clicking the uploader still opens the native file explorer, and manual selection works.
The issue only affects Mendix apps.

Other internal tools (e.g. Service Now) continue to support Drag & Drop functionality in Edge.
We are on the latest version of the File Uploader Module.

Edge Console Error
The following error appears in the Edge developer console when attempting Drag & Drop:
NotAllowedError: The request is not allowed by the user agent or the platform in the current context. Failed to execute getFile()

This suggests that Edge recently introduced or tightened a security restriction, which prevents the widget from accessing the dropped file.
Timeline
The problem started about one week ago without changes on the Mendix side.
Our assumption is either:
A Microsoft Edge update introduced a change that breaks compatibility, or
A Siemens Energy security configuration changed in combination with Edge’s security behavior.
Reproduction Steps

Open any affected Mendix application in Microsoft Edge.
Navigate to a page with the File Uploader widget.
Attempt to Drag & Drop a file onto the drop zone.
Observe that nothing happens and no upload starts.

Expected Behavior
Drag & Drop should initiate file upload as it does in Google Chrome (same app, same user, same environment).
Actual Behavior

Drag & Drop is ignored.
No UI feedback is shown.
Error occurs in Edge console only (see above).

Request
Please:

• Confirm whether this is a known issue with the File Uploader Module or Mendix Web Widgets.
• Provide guidance or a hotfix to restore Drag & Drop support on Microsoft Edge.
• Clarify whether updated browser permission policies require an update to the module.

BR
Reto