My OneDrive wasn’t syncing, so I Googled and got this page.
I spent an hour trying to do what it said and could never get the engine showing in Task Manager.
I happened to check my notification tray, and found a OneDrive error.
Two of my file names of a .doc and a .mp4 had bad syntax and this was preventing the entire upload.
I fixed the two names and the engine now shows and my files are uploading.