Unable to Share or Attach Files in Teams Group Chat

Bindu M S 60 Reputation points
2026-10-01T05:06:11.34+00:00

We have created a group in Microsoft Teams that includes internal users and one external user from another organization. However, some users are unable to share or attach files within the group chat.

Could you please help us investigate this issue and provide a resolution?

Microsoft Teams | Microsoft Teams for business | Teams and channels | Manage a team or channel
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  1. Jade Ng 15,860 Reputation points Microsoft External Staff Moderator
    2026-10-01T06:32:48.1566667+00:00

    Dear Bindu M S,

    According to your description, I understand that some users are unable to share or attach files in a Microsoft Teams group chat that includes a user from another organization.

    To help narrow down the issue, could you please clarify the following:

    • Are the users who are unable to attach files internal users, the external user, or both?
    • When the affected users try to attach a file, what exactly happens? Do they receive an error message, or is the file attachment option unavailable? If there is an error, please share a screenshot of the exact message.
    • Does this issue occur only in this specific group chat, or are the affected users also unable to attach files in other group chats?

    Please provide additional details and respond to the questions above so that I can better understand the issue and assist you further.

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