Animating dotted lines...

[Bronto]

That's an idea - I'll take a look, thanks!

[Fred C]

Use 3 'sets' of dots; show each set sequentially.
(Click GIF for animation)

[wizard509]

The concept that cshez cited has lots of uses, and it works very well.

What Fred shows works very well too.

[Bronto]

Great thanks. I went with the 3 dots/dashes combined with a clipview clone over the original photo which I pulled back to reveal the dashes as per Gare's vid.

Thanks again.