Why can't I drag and drop files in Microsoft Teams anymore?

Dear @Brianna Buchanan (DFFH),

I understand how frustrating it is to lose the drag-and-drop functionality for webinar resources, especially when managing sessions with over 100 attendees. Based on your description, the most likely reason this stopped working is the transition from the Classic Teams to the New Teams app after upgrading to Windows 11.

The "New Microsoft Teams" client, which is the default on Windows 11, has had documented inconsistencies and limitations with the drag-and-drop feature for file attachments in chats. While the classic version handled this reliably, many users have reported that the new version does not support dragging files directly from their desktop into a chat window.

While we wait for Microsoft to stabilize this feature, here are the most efficient solutions for your webinars:

1. Use the "Attach" Button (Fastest Workaround) Instead of dragging, click the "Attach" (paperclip) icon beneath the chat message box. Select "Upload from my computer" and choose your file. This takes only a few extra clicks and is currently the most reliable method for the New Teams app.
2. Upload to OneDrive First (Best for Large Groups) Upload your resources to OneDrive or a Teams Files folder. Then, in the chat, click "Attach" and select "OneDrive" to send a link. This is often better for large files and ensures 100% delivery success.
3. Try the Teams Web App As a test to confirm the issue is client-specific, please try logging into Teams via your browser (Edge or Chrome). If drag-and-drop works there, it confirms the limitation exists specifically in your installed New Teams desktop client.

A Note on "Classic" vs. "New" Teams

Several users in similar situations have confirmed that when they reverted to the "Classic Teams" (which is no longer supported or recommended by Microsoft), drag-and-drop worked again. However, since Classic Teams is being phased out, I strongly recommend adopting the Attach button or OneDrive link method as your new standard operating procedure for webinars.

For further details, you can refer to the official Share files in Microsoft Teams - Microsoft Support

I hope this helps explain the situation. Please let me know if you need further clarification.

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Dragging and dropping files into Microsoft Teams chats is still supported, but behavior can change based on admin policy and storage configuration.

For business tenants, Teams admins can change the default storage backend that handles drag‑and‑drop uploads. If this was recently changed (for example, during or after the move to Windows 11), drag‑and‑drop can stop working for users if:

1. A third‑party storage app is configured as the default upload target but
2. That app is not installed for users, or
3. The app does not support drag‑and‑drop.

These are documented user‑side error conditions for drag‑and‑drop to third‑party storage.

To restore drag‑and‑drop behavior, a Teams admin should:

1. Check the current Teams Files policy
   • Run in Teams PowerShell:

          Get-CsTeamsFilesPolicy -Identity Global
     

   • Review the DefaultFileUploadAppId value.
2. If a third‑party storage app is set and causing issues, either:
   • Point it to a valid app that supports drag‑and‑drop:

          Set-CsTeamsFilesPolicy -Identity Global -DefaultFileUploadAppId "<appId>"
     

   • Or revert to the default (OneDrive/SharePoint) behavior by clearing the setting:

          Set-CsTeamsFilesPolicy -Identity Global -DefaultFileUploadAppId ""
     

3. If necessary, remove the custom Teams Files policy entirely:

      Remove-CsTeamsFilesPolicy -Identity Global
   

   Or, to remove all custom Teams Files policies:

      Remove-CsTeamsFilesPolicy
   

After the policy is corrected and replicated, drag‑and‑drop file uploads into Teams chats and meetings should resume working as before.

Note: This policy does not affect image or media copy‑and‑paste, only cloud file uploads.

References:

• Admin settings for file drag-drop to third-party storage