A practical walkthrough
Give a character a breathing idle
Start with a rigged monkey, change a pose and export your first loop.
Open the monkey example ↗1. Open the example and watch a loop
Open the monkey example below. Play its idle clip, then pause and scrub the timeline. Notice which parts move together. The hierarchy connects each piece of artwork to the bone that moves it.
2. Make a small change
Select a body bone in the hierarchy and switch to Animate mode. Select an existing keyframe near the middle of the idle clip. Make a small change to vertical position or scale in the inspector. Start with a subtle change; large breathing movements tend to look like jumping.
3. Check the seam
Scrub from the last frame back to the first. Their poses should match for a seamless loop. If your edit makes the character snap, undo it and change a middle pose instead. Play several loops and check that feet and other planted parts stay steady.
4. Export and keep an editable copy
Open Export, choose GIF and render the active animation. Use project JSON to keep an editable backup; a GIF contains rendered frames, not the bones and keyframes. Your project also autosaves in this browser.