Supported way to use consenting user-provided media in a creative experience?

I'm working on a creative tool that integrates with Meta's ad stack. For one feature, I'd like users to voluntarily provide a single photo of themselves - explicit opt-in, first-party - used to generate a personalized creative for that same user.

To be clear: I'm not asking how to access platform-stored user images or anything the APIs don't expose, and I'm not trying to work around any privacy boundary. My question is only about the supported, compliant way to handle media a user themselves chooses to contribute.

Specifically:

1. Are there documented patterns for capturing user-provided media within the Meta ad ecosystem (interactive/playable formats, Instant Experiences, partner flows)?

2. What consent, retention, and review considerations apply when a creative uses a user-supplied image of themselves?

3. Is there an officially sanctioned format where user-contributed media is permitted vs. disallowed?

Mainly want to get the consent and data-flow right from day one. Pointers to docs or precedent welcome . Thanks!