How do you properly create an iPhone mockup with your app screenshot? Higgsfield keeps changing the content inside

Working on a project where I need to show my app on an iPhone screen — clean, like in real ads. Thought Higgsfield would handle it, but ran into a problem: it keeps modifying the content inside my screenshot. I upload my actual app screen and it starts "interpreting" it — changes text, icons, layout. The result looks similar but it's just not my app anymore.

Question: how do you guys create iPhone mockups with a real app screenshot without the content getting distorted?

What I've tried so far:

Higgsfield - rewrites the screen
Plain overlay in Canva - looks cheap and flat

Heard about tools like Rotato, MockUPhone, shots.so - worth going that direction? Or is there a way to use AI video tools properly and just lock the screen content?

Any advice appreciated, deadline is coming up 🙏

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