GIF uploads not working. File shows "undefined" after upload.

[some guy]

Hi,

starting today, I am unable to use the GIF option successfully.  After clicking on GIF and finding an image, it looks like it uploads, but then it shows as "undefined". 

After clicking "Post", it looks like this:

If I click on it, it looks like this:

I have tried this several times with IE11 and Chrome with the same results. Other files seem to work ok. Has anyone else run into this? 

Thanks!

Brian

[#2]

Apparently Yammer are testing a different GIF provider. I have seen the same issue across multiple networks and groups.
It's not ideal for a feature so newly released.