Screen Capture - Video Preview

Hi there,

I’m hitting a bit of a wall when it comes to the end card for the Video preview, after someone has recorded footage. Any image I use, doesn’t seem to fill the preview card correctly.
I also can’t seem to get the “end-card-call-to-action” to show up

And while I’m here, is there a way of changing the record button UI image to something else?

Apologies if I’m missing something simple here, but any assistance here would be appreciated. Thank you