Movies play on laptop but not when I transfer them to the USB


I have a 1tb USB and some of the movies i've put on there work fine but now when i put a movie on there which is MKV or MP4 I get the following error message:

'Can't Play

This file isn't playable. That might be because the file type is unsupported, the file extension is incorrect, or the file is corrupt.'


Please help!!

System Configuration: Windows / Chrome 93.0.4577.82