@[email protected] That post is somehow deleted by the mod so I could only reply here

I’m not personally familiar with Synology’s products, but if what’s going on is that you’re using some built-in feature of a Synology NAS to copy files from a USB drive to the NAS and seeing an error, I’d probably try copying that particular file to somewhere else on a PC, cutting the NAS out of the loop, to make sure that you don’t have, say, a corrupt filesystem where attempts to read the file contents are failing.

USB Copy is a built in application in synology. I set it up to do mirroring backup of several folders each day. Copy files to a PC works for me but not a long term solution