Hi
This one is a strange one!
Is you calculator up to date?
Also is the storage formatted in fat32?
If it is you can’t transfer files over 4GB so I would check that
Is the software up to date for it as there could be a known bug or issue that has been resolved in a newer version
If the above doesn’t work you might want to try reinstalling the calculators OS
Hopefully this helps
Any questions please ask
Thanks:-)