Sometimes a copy is a shortcut, which is unacceptable. Although I could listen to it on the computer at that time. But when you get to the USB flash drive, it's the same. There is no source file. . .
You can use cool dogs. Actually, it's all good. If some songs can only be found on q music. It can only prove that your copying method is wrong. . . Or ... a computer program problem. You can try to restart it. Or choose other download methods.
I'm happy to answer your question. I hope I can be satisfied.
~.~