Retaining iPhone pictures after clearing iPhone

I have researched external libraries. My understanding is that external libraries are not uploaded into Immich, and if I delete a photo in an external library, it will be marked for deletion in Immich.

When I connect my family iPhones using the Immich app, and we sync our photos,

1.) Are the iPhone photos uploaded or treated like an external library?
2.) If I delete the photos on the phone, how do I ensure they are not removed from Immich?

Thank you for your feedback.
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