As Im Copying Files, Folder and Contents Disappear Minutes Later

My Cloud OS 3 Personal & Network Attached Storage My Cloud
10

If the access rights on the files (on the file server) aren’t right, Windows won’t show the files. You can log in to MyCloud via SSH, then go to the directory in question, and do an ls -l to see if the files are there, and if the access rights look odd.

owner:group should be [username]:share
Permissions should be 775