Please mention the version you're using.
Also does the animation (+ 2 seconds) plays in PS?
How do you save the gif?
It should be 'File - export - Save for the web (legacy)' and choose 'gif' as extention.
Which version of Ps CC do you have? Please post a screen shot. I say this because as far back a CC 2014/15, Ps CC has had "Save for Web (legacy)" under "export". This was not present in earlier versions.