OneDrive is stuck on “Processing changes' You may inadvertently lose work not saved properly by the program that created it. We recommend that you do not delete any TMP files unless you know for sure it is no longer in use.

If you move, rename or delete a file it may not work with its original program. TMP file is a file that is created to temporarily store information in order to free memory for other purposes, or to act as a safety net to prevent data loss when a program performs certain functions.