Hi @ItsChilly410 ,
Could you tell me:
Have you created an app in teams? Is your data source dataverse?
If my assumptions are correct, at my knowledge , apps created in teams currently do not support attachments.
The dataverse of powerapps studio supports attachment function. When creating a table, you could check the setting to enable attachments.

However, there is no such option when creating a table in teams.
I think you could try to create app and table in powerapss studio, and embed the app in teams to use.

Best Regards,
Wearsky
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