Pausing (and then continuing) on motion paths

[Mat Tinker]

Hi. I have a series of looping square motion paths in Powerpoint. They begin movement when a first graphic is clicked.
I would like the animation along the motion paths to pause temporarily when a second graphic is clicked. I can achieve this by pressing '1' on the keyboard, but would like to replicate this functionality with a clickable graphic.

The motion path should then continue where it left off when the first graphic is clicked- which can again be achieved by pressing '!' on the keyboard, but again, would like to replicate this with a click.

Thanks in advance!