File Sharing Problems

How to Fix Cannot Attach a File to Microsoft Teams Assignment

Maira Mehtab Sep 22, 2026 869 views

Question details

Students are unable to upload or attach files to their Microsoft Teams assignments and receive an error, even though their account permissions seem correct.

Product: Microsoft Teams
Device & OS: not provided
Scenario: Submitting homework or project files to a designated assignment within a Microsoft Teams class.
Observed behavior: An error message blocks the file attachment process. The issue persists despite correct student permissions and affects multiple classmates simultaneously.

Before you start

Verify with your classmates to see if they are experiencing the same upload error, which helps confirm the issue is on the assignment's server side rather than your local device.

Solution 1Recommended

Contact the Assignment Owner to Restore SharePoint Folders

This error occurs when the backend SharePoint folders used to store attachments have been accidentally deleted. The teacher or assignment owner must restore them.

When an assignment is created in Microsoft Teams, the system automatically generates specific folders in the class's SharePoint site to store student work. If the teacher or an administrator accidentally deletes, renames, or moves these folders, the connection breaks.

Because this is an infrastructure issue rather than a permissions problem, students cannot fix it on their own. The assignment owner must restore the folders from the SharePoint Recycle Bin.

Identify the scope of the error

Check your internet connection and confirm with other students that they are also unable to attach files to this specific assignment.

Notify the teacher or assignment owner

Reach out to your teacher and explain that the assignment's SharePoint attachment folders might be missing or deleted.

Teacher restores the deleted folders

The teacher needs to navigate to the Teams channel, click on the 'Files' tab, select 'Open in SharePoint', navigate to the site's Recycle Bin, and restore the deleted assignment folders.

Note for Teachers: If the folders are not in the first-stage Recycle Bin, check the second-stage (Site Collection) Recycle Bin at the bottom of the page.

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Frequently Asked Questions

Why does Microsoft Teams say I lack permission to attach a file?

Teams often displays a generic permissions error when the underlying SharePoint folder meant to store your attachment is missing. This usually means the folder was deleted by the assignment owner, not that your account permissions were revoked.

Can I fix the Teams assignment attachment error myself?

No. Because the error stems from deleted directories on the backend SharePoint site, only the teacher or the assignment owner with administrative access can restore the missing folders.

Where are Microsoft Teams assignment attachments actually stored?

Attachments uploaded to Microsoft Teams assignments are stored in dedicated 'Student Work' folders within the SharePoint site associated with your class team. Any modification to these folders will break the attachment process.

Document & File Issues