Last covered here on AAWP 18 months ago, Aeries UWP, one of the premier Twitter clients for Windows 10 Mobile, has at last now been updated to support 280 character tweets. Meaning that that there are now two UWP Twitter clients which fully support longer entries (here's the other). Neither are the official UWP application, mind you, though I've been hearing rumours of that being imminent for months...

Anyway, here's screenshot proof:

Aeries is now up to 2.4.98.0 and you can buy this in the Store here. There are a number of fixes and tweaks applied in the last few versions, spanning the last month, of course (the developer seems to be re-engaged after a year's hiatus), but the longer tweet support is the one worth noting.