Problem copying files onto the e250 player - I get a pop-up telling me

It is written connected on my e250 screen and there’s some moving arrows that stays there all the time and when I try to copy files on the the player it gives me a pop-up telling me that the device is not reponding or has been disconnected which is not the case.  

I have formated the mp3 player 5 times now and I’m still getting the same message.  I’m running on Windows media center and using  MTP to transfer the files.  Please help me out with this

Anyone please !!

OK it’s not working with the drag and drop method but WM 10 is working so consider this issue solved !!

Have you conisdered using MSC mode? I am not much of a Expert with MTP, but I can vopuch for Media Monkey and MSC mode