For at least the last few weeks, the PDF viewing capbility of Teams is broken
I have a tab linked to a SharePoint Documenbt library. All is well and I can see the files there. In the past, I was able to click a PDF file and Teams would show it in its viewer.
I'm not exactly sure how long ago PDF viewing capability started failing in this scenario, but across the board, no one in our organization is able to get a PDF to load now. It tries to load in the Teams viewer (I assume that's what it is, it definitely is within the Teams app and there is no indication that it's using a browser or 3rd party viewer) but we are met with in infinite wait prompt, even for very small PDF's. They never load. Cancel functionality behaves as expected.
Also broken in Teams on Windows, and Teams on Mojave, and using Teams app in Chrome etc. when PDF are inserted into OneNote documents. (They are visible in the OneNote app.) Been this for most of 2020.