When I want to withraw from coinbase it seems I cannot choose network..I wanted to deposit to exchange that offers bep20 and erc20 deposits...anyone familiar withdrawing from coinbase¿?
Writing down exactly what you want to withdraw from Coinbase would also be good. I hope you're not trying to send Bitcoin over these networks.
Also, if it is one of the tokens for ERC20 networks (for example) you must have Ethereum to pay the TX fee.