Why my phone move some files but not some?

[Goiteom Abay]

My phone move some files but when i try to move other files it tells me "operation failed"

 

[SpookDroid]

Are those files still in the phone (and not previews/corrupted files)? Are you trying to move files on an SD Card using a non-stock File Manager? If so, this was restricted a while ago on Android. Are the files currently in use? Have you tried moving the file one at a time?