There is no SanDisk app that I am aware of that issues that message. (That doesn’t mean there isn’t, just none that I’m aware of.)
You might need to copy your Flash Drive files back to your pc, then delete all the files on the Flash Drive, especially all .exe ones, then copy your files back to it and try it in another pc.
First thing I asked him was if I could copy files to the flash drive using SanDisk Secure Access Manager on more than one computer? He said, “Definitely.”
So, then I explained that i was getting the error message I described above on the 2nd computer.
He had me try it again. I copied a single 24 KB file and this time there were no errors.
Naturally, I was still puzzled by the error message I got last week. He agreed that the error message text is misleading and can indicate a variety of problems such as a poorly seated flash drive to corrupted data or a user error doing a copy & paste or click & drag. He recommended click & drag as the best option.
I’ll do some more backups before closing this out. But so far so good.