I added eth to trust wallet. I’ve also added several altcoins (reef, forth, lto, and 3-4 others) and swapped a part of eth for each of them. However, every transaction failed and said error. Does anybody know why?
What kind of error message that's showed in your wallet?
If you have been using the swap feature on the trust wallet and it will not work properly as it will need a lot of fees to pay the transaction.
I think that you must connect your trust wallet on uniswap but if an error message was appearing after you have tried to swap on uniswap and the problem should be you are putting very small fees.
You should try to adjust the fees for swap transactions.