Additional meeting and call-related features and issues within Microsoft Teams for business
Hi AWDROffice
Thanks for your post in the community.
From your description, we'd like to know if the issue appear when you use Teams client on PC. Besides, is there the error message or what is the phenomenon when you don't view PPTs on Teams mobile app?
Besides, if you select PowerPoint directly to share, as a workaround, you can choose the method of sharing Desktop and open the PPT like the screenshot below.
If you have anything unclear, please feel free to let us know.
Regards,
Joey