Twitter won't recognize.gifs in my camera roll after iOS 10 update

After updating to iOS 10 - Twitter won't recognize.gifs in my camera roll.

It posts them to Twitter as a still photo.

I dont know if this is an iOS issue or a Twitter issue, but after weeks of waiting to hear back from Twitter, I thought I'd see if anyone else was having the same problem.

Twittter support *****!!

Cheers and thanks in advance.