Creative Cloud Sync Error - Some files failed to sync.

I can manually upload files to the Creative Cloud file storage, but the Windows application will not sync files larger than approximately 3-6 megabytes in size. Larger files dropped in the sync folder just generate the message "Some files failed to sync," regardless as to how long I wait for it to attempt the sync. The audio files we need to sync vary in size from 30-70 MB, and there is plenty of space available for file storage (already resolved the low storage issue due to the bulging deleted items folder). 

Followed all of the directions on the related help page, all to no avail. I thought one of the Context Menu "View on Website" keyboard shortcuts would be the answer, but this option is greyed out on files or folders showing the sync failure.

Following directions in another post, I deleted the .db files in the AppData Core Sync folder. No change. 

Also tried using the Adobe Creative Cloud Cleaner Tool process prior to reinstalling the Creative Cloud libaries application.

Any other suggestions would be appreciated. The upload option works, but since Premiere can use the Creative Cloud sync folder as an export destination, the upload option adds an unnecessary post-production step.