The USB only supplies power to the Roku unit. It has no other function. Since the USB ports on many TV's etc supply less than the 1 amp your Roku needs to operate reliably, your best bet is to connect your Express to house power via the provided USB power adapter.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
