Additional file-related features and issues within Microsoft Teams for Education
Hi Ange_b,
I'm Nik, an independent advisor here to assist you with this.
I am afraid that the email notifications are sent from office 365 rather ms teams, so any changes to teams notifications settings will not help.
I found a UserVoice on the same issue:
https://office365.uservoice.com/forums/264636-g...
Please note that when you upload a document in channel, it get saved to a SharePoint library. I suspect that it creates an alert to the document in SharePoint.
Regards
Nik