When you import chat history into a chat from other apps, imported messages will be sorted by original sending date and merged with existing messages in:
Newly created 1-on-1 and group chats.
Any existing 1-on-1 chats that have fewer than 1000 messages (on Telegram).
Smaller existing group chats with basic settings that have fewer than 1000 messages (on Telegram).
Unfortunately, it is not possible to merge existing and imported message histores in chats which have more than 1000 messages and in large groups (or groups with altered settings: e.g., with "message history" set to visible for new members, etc.)
In the cases when it's not possible to merge histories, imported messages are placed into the moment when they were imported. All messages include their original timestamps and follow one another in the correct order.
Workaround
To make it easier to navigate chats where merging is not possible, you can pin the last message in the chat before you import messages. This way you can quickly jump past the imported messages if you need something above them.
I nave imported a chat from whatsapp, the chat was going on since 2015 and only the last year is imported. I don't know if is a whatsapp export limit but if it is a known issue an advice to the user would be useful. Luckily I haven't deleted the chat from WhatsApp after the import
Ah, I thought it wasn't, because in another test, some contacts who have Telegram, but were not in the group, appeared with name. Even some contacts that didn't have Telegram.
Yes, only the name remains, without the link and photo of the profiles on Telegram. Got it. It's because, in particular, I think it's a little strange see the phone number instead of the name with some contacts. And I thinked even more it was a bug because WA also provides the name of the contact, so I thought that Telegram was not able to link the number with each contact, I don't know if I managed to be clear lol
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