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:
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.
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.
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My chat is completely uselss right now.
Since i had a couple months of history, suddenly now i got a year of messages spammed in the middle, and I'm supposed to just continue where i left off?
Also deleted the imported messages is not possible, since you can only select 100 at a time which would take ages to do.
Why not give users the option if they want it sorted by date? (which imo would make sense - it still has the "this message is imported" flag visible)
the technical limitations should've been already assessed before rolling out the feature.
There are many options to adapt the technical framework to make a useful feature out of this.
Telegram needs to put a notice like: "Check if your name on Telegram is exactly the same as WhatsApp".