Custom Teams AI Bot does not have attachment button

Hi kmartin​ ,
Your manifest includes "supportsFiles": true, which is correct. Your Bot Scopes are also correct.
The issue where the attachment (file upload) button does not appear or disappears in your custom Teams AI bot might be related to Bot Channel Registration.

You must enable file uploads in the Teams channel configuration for your bot in Azure:

1. Go to Azure Portal.
2. Find your Bot resource.
3. Under Channels, select Microsoft Teams.
4. In the Teams channel settings, ensure Enable file upload is set to Yes.
   
   

Limitations: The attachment button is only available in 1:1 and group chat scopes, not in channel conversations.

Caching/Manifest Updates After updating your manifest, uninstall and reinstall the app in Teams to ensure the new manifest is loaded.

Thanks!