How to optimize list data for chat

I have a group management app that I’ve built with multiple chat windows. I’m working on optimizing for native and slower devices, and I can’t figure out the settings needed to only show the last 15 messages but in descending order with the most recent at the bottom.

When I try to show just 15 messages, I can either get the 1st 15 (with the last of that 15 at the bottom), or the most recent 15 (but the most recent at the top), but not the way I described above.

Any help would be appreciated. Thanks

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