After discussion with Twitter Network Engineer it looks like the network problem is now fixed (at least for me). I’m not sure if they applied a global network fix, or a “testing” fix, so not sure if it’s permanent or not for now.
For those who have the “missing url” error, this is NOT related to this issue, and i don’t think it’ll get answered here.
I’ll wait maybe a good 48hrs before saying it’s officially fixed, but for now i’m able to post tweets with media at a very fast rate, so i’m happy with the solution.
Thanks Twitter,