1. Resize image to 500 px width. If you’re image larger than 500 pixels, tumblr will NOT play your gif.
2. Open Animation Window (it’s under Window, then click on Animation) add layer on each frame, turn on the ones that you want to show, and adjust the timing on each frame. You can add quite a few of these. But if your file is too large, tumblr will not play it properfly. Also, I like to set mine to FOREVER, so it keeps going on a loop.
3. Save for Web and Devices. Make sure it’s a gif file.
Have fun! And give yourself a treat and have a pumpkin cheesecake on this wonderful national Holiday!!!!