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.
This is indeed a problem. I switched to Telegram a month ago and with the import I have to scroll waaaaaaaaay back to be able pick up the conversation again. The imported messages should be inserted in the chat in the order of their original timestamp, not the order of the import timestamp.
even if it's intended: at least notify users about the approach. As it's not marketed, it seems like you can simply import your history and combine both whatsapp & telegram chats in 1 (in order to delete your whatsapp) at least provide users more information how the import works or what the result looks like
This behavior is mentioned in the blog. “Messages will be imported into the current day but will also include their original timestamps. All members of the chat on Telegram will see the messages.” from https://telegram.org/blog/move-history
I have an idea. isn't it possible to create a new message infrastructure so you have the regular messages and the imported messages. At the end the client just merge them together when you view them. This will not interfere with any other old technology. Also it is now possible that user delete all imported messages at once! And the old clients are also fixed because they just can't view the new second message system! This would be the perfect solution as this would fix future problems too. This would fix all problems (in my head) just tell me if I miss something.
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As it's not marketed, it seems like you can simply import your history and combine both whatsapp & telegram chats in 1 (in order to delete your whatsapp)
at least provide users more information how the import works or what the result looks like
“Messages will be imported into the current day but will also include their original timestamps. All members of the chat on Telegram will see the messages.” from https://telegram.org/blog/move-history