Photos not uploading to iCloud
My Mac photo library had been stuck uploading 15,000 photos to iCloud (out of 30,000 photos) for days. In order to fix this, I toggled on and off syncing Photos to iCloud in system preferences, which kick started the upload process from the beginning again. There was 128GB of data to upload and it took 24 hrs to complete. However, once the uploading of the 128GB of data was complete, Photos indicated there were still 7,000 photos to upload. Photos is now stuck with 7,000 photos to upload and will not move.
I am using MacOS Sierra 10.12.6 and all available updates are installed.
Any suggestions on why the upload would complete, but then still have 7,000 photos to upload? I am reluctant to restart the process from the beginning again.
iMac, macOS Sierra (10.12.6)