Cruzer Flash drive not being read in digital picture frame

I have transferred pictures (JPEG format) onto my flash drive to view on digital frame and will not play…the frame manual states something about not playing preformatted drives…and uninstalling the software…please help I am not sure what to do

well we will need more information on this

“the frame manual states something about not playing preformatted drives”

also if the drive has U3 uninstall that first. 

U# is not installed on the drive. Attempted to download U3 software but according to software I do not have a U# compatable jump drive