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.
+to fix name importing issue ask me about my name from avilable names on database.. This may be the only available solution because there is group chats with alot of names
Status changed to Fix coming
Admin Dog
We are working on a solution for new imports into empty chats. (Due to architectural constraints, mixing messages into the past sections of large existing chat histories is not likely to become available soon.)
Enzo
sometimes the contacts also don't appear with a name, only their numbers, even contacts that have Telegram.
+1 It seems that import bot sometimes can’t connect the phone number with person’s telegram id even with the who-can-see-my-phone-number->everybody setting in his privacy. Also, it depends on who is importing
Andrea P.
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
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This may be the only available solution because there is group chats with alot of names
It seems that import bot sometimes can’t connect the phone number with person’s telegram id even with the who-can-see-my-phone-number->everybody setting in his privacy.
Also, it depends on who is importing