How to copy and past directories from Passport drive to book live 2 TB drive

for some unknown reason that i cant understand, i cant copy whole directories (film Mp4 format) from a passport WD drive to My book live Drive 2nd Generaction.

It would help if you give more detail as to what happens when you try…

Every time i click on the directory with the films in i try to drag to drop them on the drive and it comes with like a no entry sign, on the files??? Thanks for replying:)