MyCloud 3TB how to resolve possible index database corruption

My Cloud OS 3 Personal & Network Attached Storage My Cloud
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Do you have a USB hard drive attached to the My Cloud? If so make sure USB Content Availability is disabled in the My Cloud Dashboard > Settings.

If one has used WD Sync then they may have a hidden folder on their My Cloud using up space. This folder won’t be found using a file explorer. One has to use SSH and search for the hidden WD Sync folder.