We are having some issues uploading photos under the files tab in Teams. It looks like it's uploading and we get no error message but the file never appears. I get an email notification saying that there's a new file with the name ~tmpBFXXXXXXXXXXXXXX.jpg in the library but there's no file. I've tried changing the photo format to .jpeg and turned off live photos but to no avail. If you post a photo in the 'Posts' page it works fine.