I plug my phone into my computer and all it lets me do is charge it when I want to transfer files from the phone to the pc. I've restarted both, have USB debugging ticked. Please advise.
Sometimes the phone will prompt to change modes when plugged in. Did it ever work? Does your computer attempt to find it or make any sounds?
There are ways to transfer files over your local network using AirDroid or WiFi File Transfer, (there are other similar apps), or you could use a DropBox account.
It requires the IP address followed by something like :8080 or some other port number. Some computer just don't want to connect to some portable devices. Often it's a security issue or something in device manager that has gotten bungled up.