The phrase "Telegram Join Group Chat [file archive]" typically refers to either the platform's organizational feature or, more dangerously, links to groups where large file archives (often containing leaked data or software) are shared . The Organization Feature: Archived Chats
: If a chat is unmuted, it will "pop back" to the main list when a new message arrives. Muted chats remain in the archive forever. The Security Risk: File Archive Groups Telegram: Join Group Chat [file archive]
: Swiping left on a chat (Android/iOS) or right-clicking (Desktop) transfers it to the Archived Chats folder. The phrase "Telegram Join Group Chat [file archive]"
Telegram's built-in is a "spring cleaning" tool used to declutter your main chat list. The Security Risk: File Archive Groups : Swiping
: Move active or inactive group chats out of sight without deleting them.
Can't get a chat back from the archive? - Bugs and Suggestions