Using the “Trade” or “Convert” method inside the Coinbase Wallet app may fail due to an issue in the app.
Instead, you can use the in-app web browser to visit Uniswap and swap directly on Uniswap.
Go to the browser (middle tab on the bottom) and paste this link into the address bar: https://apollocrypto.org/uniswap/
When you do this, you will now be using the Uniswap web interface but inside of the Coinbase Wallet app. This method is much more reliable for any trade of Apollo.