[Tim Osborn]

I’ve been back here twice looking for answers.. so for future visitors: the best tutorial I’ve found on the subject is: https://www.adobe.com/designcenter-archive/encore/articles/enc15subpic.html

One technique suggested is to make the buttons part of the background, and only use the subpicture elements for highlighting around that button.. the whole process is mind bending from a web design perspective!

[Tim Osborn]

This was helpful to me – thanks, I didn’t think of using the Null..

For posterity, my variation on this technique is to:

• create a null
• create a motion sketch path on the Null layer
• right click the null.position property and ‘separate x&y’
• select the keyframes from x or y
• click on the destination layer’s rotation value
• Move the playhead to the desired time and paste!

Note that to edit the keyframe values, you can select a range of keyframes, click on their value field and type *-0.5 (for instance), to modify them all mathematically..

Not a complete solution – I actually found the result impractical because the values spun too wildly for my needs.. just thought I’d share, as I appreciated the OP’s tip!

Cheers, Tim