Thanks for the answer!
Regarding the exchange - I just swapped some BNB (I had some dust on Metamask) for DTUBE tokens. I did it inside Metamask, but as far as I understood, I can also make such exchange on PancakeSwap, I just didn't have money for the commission, so I had to choose the option without commission, but at an unfavorable rate, however, it doesn't matter, it was just an experiment. I want to say that the exchange seems to work, the problem is only with the connection of Metamask to the site.