UniSwap Fail

I’m trying to become a liquidity provider and when I submit the transaction it always fails. When I look at the failed transaction, it shows as if I didn’t input any gas fees and has “?” for gas fees. I do edit my gas fees before I press confirm but I make sure to input higher gas fees so that my transaction goes through. Also, I change the fuel to 21,000. Lastly, I haven’t lost any ETH from the failed transactions either. Let me know if I’m doing something wrong.