[G4] flash drive question

[Ray Clayton]

I do most of my work at home on a G4/733, OS9.2.2 and transfer my photoshop
files on a flash drive to the server at work. Recently the computer at work
has been upgraded from a G3/266 (don't laugh!) to a G4/800, OS10.4.8.

Now the files I want to transfer from the flash drive show up with a
generic/gray preview and have to be opened and re saved. The same files
prepared the same way transfer with no problem when burned and transferred
by CD.

Must be something about the flash drive, yes? Suggestions, workarounds?

Ray