My computer only recognizes my ipod touch 4th as a camera gone through troubleshooting but hasn't fixed it.

I bought this ipod touch 4th generation used. Trying to add my own music onto it but the only way I can access the songs I have in itunes is if I am logged into itunes on my pc. Then the list will show up on my ipod. When I plug the ipod into my pc it only shows up as a camera. I have tried the troubleshooting but it has not fixed it.