Additional team and channel-related features and issues within Microsoft Teams for Education
Hi Bryson C
Thanks for your post in the community.
From your description, I have done some tests. Actually, the PowerPoint which are uploaded in Files tab can’t appear in the PowerPoint list when you share the screen. However, as a workaround, you can choose Microsoft Teams under Window when you share the screen.
Then you can access to the folder under Files tab below and choose the file you uploaded like the picture below.
I hope this information can help you. If you have anything unclear, please feel free to let us know.
Regards
Joey