More OneDrive Problems

Like a lot of other people, I’m having problems using OneDrive with my Mac.

The icon on the menu bar says that all files are synced, but when I look at OneDrive in Finder, almost all my files show the double arrows to indicate they are syncing. If I try to open any of the files with the arrows I get a message saying that the file is either damaged or is a type not recognised. Clearly the latter is not the case as they are e.g. .jpg files.

If I look at OneDrive on the web, or on my iPhone or iPad, it is out of date.