Hi @Michael D Gyton ,
How did you prepare PowerPoint reports in Microsoft Teams? Screen share or using Presenter View?
Do you have the same issue when using Teams web client?
According to your description, your issue seems related to your Teams sync. If you're having sync issues in Teams, a banner appears at the top of the app containing a Refresh link. Click the link to restart your app; you should be fully synced once everything is up and running again.
In addition, please try to sync your SharePoint and Teams file with your computer.
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