You can add any sort of content to a CARD in a MIX.
Here's how to add videos and gifs:
1. Insert the video or gif url in the "CREATE A CARD" field.
2. All video info is automatically added to the CARD.
3. You can edit the title and description as you wish.
4. Click SAVE.
tchop tip: You can also add an image or a gif to the cover image of a MIX. Just insert the gif or image url address to the Image URL field in "+MIX"