According to the requirements of the school, some schools said that if your documents were sent from the mailbox of a public institution (such as a school), you don't have to sign them. If you fill in the online form like UCL, you won't get the signature at all. Everything else needs to be signed. Otherwise, who can prove that you wrote this letter? They also know that you are pretending, but you have to pretend.

If you get an OFFER, you shouldn't send anything, but if your file is untidy, they won't try it at all. Generally, you don't have to post it on the internet, and it's no problem to post it. They throw it away at most.