It was not the reason since I could post the same photo if I used a different platform. I am not sure what you mean if it comes to messenger but I don't use it so can that's why it doesn't ring a bell,
I assume the pictures aren't per se smaller and if that is the case why is it that Davide said the picture I uploaded with imgbb is very poor if it comes to what is shown. It's smaller thatn the other one but to me the quality isn't that bad.

Anyway, I hope the problem is solved
By the way I did save photos on Telegram and tried to use them but that didn't work either.

A happy day.