Timeline Panel missing button in the middle of it, unable to select Create Frame Animation

[bernie_west]

I've tried reseting my preferences as per https://forums.adobe.com/thread/2317982, but that doesn't fix it.  It does put the button on the panel when an empty document is open, but when I import "Video Frames To Layers" it opens in a new document and the button isn't on the timeline panel in that document.  It's in the other blank document though.  How can I get it to show in the document I'm working in?

[Mylenium]

Without any system info and details about the footage you are trying to import nobody can tell you much. Smells like a CoDec issue vs. hardware accelerated video functions in PS.

Mylenium

[bernie_west]

It was there a month ago or so.  I'm trying to convert a 20 second MP4 to a gif.  I can't see why there should be any trouble doing that.