You need to run the cli with the flags to be able to import your paper wallet:
electroneum-wallet-cli --generate-from-keys WALLET
Thank you Enerjay. This was the most useful post in this thread for me. I was missing the "generate from keys" flag.
However, I have been mining all day at 1300 h/s and it says Balance 0.00, unlocked balance 0.00

Any insight?
I've been having the same problem.. i think it's because i'm not part of the pool.. i was mining on my own.. about to start mining using the pool.