Masking animated scroll

[BenSCR]

How can I mask the 'Stiched Together' B&W photos they only appear in the center of 'Purple Frame'.

<iframe title="vimeo-player" src="https://player.vimeo.com/video/390200483" width="640" height="640" frameborder="0" allowfullscreen></iframe>

https://www.youtube.com/watch?v=tB5FDoUug8c&feature=youtu.be

[Mylenium]

Your links are totally defunct. You need to try again and give us something that can be accessed publicly without any log-in requirements or passwords.

Mylenium

[BenSCR]

I've embeded the video, hope it can be viewed. And I've also uploaded a 'YouTube' link.

[Rick Gerard · Accepted solution]

Pre-compose all of your image layers, create a solid or shape layer the size of your square, put it abo e the animated image layers pre-comp (nested comp) and set it as an Alpha Track Matte. Problem solved.

[BenSCR]

Thank you, "As easy as 1, 2, 3!!!