You can add animation to animated GIF as a separate frame. Any GIF animation can be used
as a separate frame. This allows you to attach as many animations as you want.
Inserted animation will run one repetition of the full cycle no meter what frame duration
is selected.
Frame duration will be the delay applied to the last frame of inserted animation.
You can split inserted animation as well and modify it or set that delay that is needed.
You
can update existing animation by inserting an animation. To insert image you need to split the animation. Then you have to specify positions for
each frame.