First, thank you, Wagas,for replying. I really appreciate it.
I have done all that you have suggested. My phone is up to dfate. The app has been reinstalled twice but I have just deleted it and reinstalled it again. Over the past week I have gone between my office and home wifi environments. It has partially synced at both locations sporadically, not completely. It has gone for up to 18 hours doing nothing and then suddenly will begin syncing briefly…then stop.
I have over 36,000 files
Before I deleted the app it was at 28,328 files remaining
I deleted the app. Rebooted my phone and reinstalled ONe Drive. As soon as I opened the app I could see all of my one Drive folders and files.
I then selected only one of the folders...."Documents" that has most of my folders & files, for Offline.
The app immediately began syncing....but when it started it indicated there were ~ 24,000 files remaining. After 30 seconds that number jumped to ~ 36,300 and kept syncing.
After about 10 minutes it stopped syncing, got the red X. It stopped at 34,440 files remaining.
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UPDATE.....I swiped down one the appand it begain syncing again. I'll see how long it syncs again.
UPDATE 2: Stopped again at 34,077 files remaining. Now it will not restart by swiping, force closing and reopening or rebooting the phone.