Frame Animation

Firstly, you have to create a new file and change the width to 1920 pixels and the Height to 1080 pixels.

Change the setting from essentials to 'Motion', then a time frame would appear on the bottom of the screen.

 Make sure you switch from 'Create Video Timeline' to 'Create Frame Animation'.

Add a key frame to the timeline.

Once that is done, change the replay settings to 'Forever' then it will become a moving GIF. And then change the frames per second to 0.5 sec.

For each frame, there should be a new layer.

Add a piece of art to the first frame, and make sure that layer is showing.

Then after adding the second layer, the second layer must not be on show on the first layer, therefore it wouldn't appear with the second layer as soon as the first piece of art comes up.

When you add the second frame, put both of the layers on show, then create the piece of art.

Both of them should then show one after the other, and because it is a repetitive pattern, it will play continuously.