Please give me orientation about how to proceed with a "dropped and replaced" transaction...

The thing is that i did an ETH transaction from my exchange, and the transaction got “dropped and replaced” after 4 or 5 hours.

I explained it in this blocked thread:

@Alan47 don’t worry I understand that TrustWallet has nothing to do with this issue, but please if you can let me continue that blocked thread conversation because there are things that I have not totally clear…

  1. What is exactly that transaction that you shown to me?. I don’t get it.

  2. The ETH amount that was sent, it is lost?, or the exchange can still re-do the transaction?.

  3. The exchanges normally will re-do “dropped and replaced” transactions automatically after some time or…? should I really personally contact the exchange to point that this was their fault and so?.

Thanks for everything.