Currently it is not possible to pay the transaction fees in STORJ. We are working on resolving that issue. In the meantime better calculate with the worst case fee (deposit ETH first). I have calculated the best and worst cost fee here: Test zkSync with TestSTORJ token - #18 by littleskunk
It is correct that you can call an emergency withdrawal if you don’t control the private keys. An emergency withdrawal comes with a significantly higher fee. Better make sure you own the private keys so that you can call a cheaper regular withdraw. There is an easy way to check that. Everyone can try to access their payout address in zkSync testnet. I am happy to send everyone testSTORJ tokens for practice.