The subject is the problem. In file C:\Users\user\AppData\Local\BTCloud-Data\Logs\log_20210223.log I find :-
---> (Inner Exception #0) System.AggregateException: One or more errors occurred. ---> System.UnauthorizedAccessException: Access denied accessing O:\PicArchive\********\Tommy
The Tommy folder had ALL permissions removed.
When the program gets to this folder it stops and goes no further, reports NO error to the user and claims all syncing is complete.
Fixing the Tommy folder permissions allowed BTCloud (20.6.1) to continue to finish the job.
Surely this could be coded better??????