Will burn after reading's information be kept on the server?

If end-to-end encryption is not used, the message will be recorded in the server.

I recommend you to use the secure chat software developed by Chinese people, which really realizes the end-to-end key agreement. End-to-end encryption allows data to always exist in the form of ciphertext in the transmission process from the source to the destination, supports the remote destruction of burn after reading/messages, and supports instant messaging such as voice, text, pictures, short videos and files, as well as network calls. In safe mode, you can also ban screen shots, so you don't have to worry about others reading my private messages anymore. o(∩_∩)o