An easy way to know file sizes before downloading is very much needed and is overdue;
Telegram allows monstrous file sizes, lots of people are on limited data plans. Those files in the pic are more than 500mb for example.
I've used to use Telegram X before and seeing file sizes were so easy on that app. But I decided to switch to the more official/foss Telegram app and now I miss this very much needed feature. It's needed specially if you're using slow or limited data connections. Please make it happen already.