In conclusion, recovering a left channel in Telegram is mostly straightforward, but recovering past conversations is not possible. By following these methods and best practices, you should be able to rejoin a channel or take steps to prevent similar situations in the future.
[2] J. Li, et al., "Cryptanalysis of Telegram's Secret Chat," in Proceedings of the 2018 ACM on International Conference on Multimedia Retrieval, 2018, pp. 121-128. recover left channel in telegram
If the channel is private, it won't appear in Telegram’s global search. You will need a direct t.me/ link. In conclusion, recovering a left channel in Telegram