How to avoid grey boxes (if you're not using xkit)!
After uploading your gif, it will appear like this:
To fix this problem, click <html>, find http://media and replace it with: https://31.media
The gif should now appear like this:
It's a pain in the butt but silly tumblr has decided to be a butt about its changes. You don't have to do this but it's for anyone who wants to see gifs instead of god awful grey boxes.












