Are you using miniDLNA service and having video files in the USB?
Also, when I googled about ".meta" folder, a result mentioned Acronis Backup.
Yes, I am using minidlna service and video files in the usb
With my 4T usb with 17G of data I can see all file via windows explorer
With the 2T usb having 1.8T of data you cannot access this drive via windows explorer. With prior BS builds you could only see some of the files via windows explorer. With Kong builds, you could see all the files. Something has changed.