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1. Create a Project from ThirdPerson template.
2. Enable Mobile HDR, MSAA.
3.Change to ES31 Preview mode.
4. Enable r.mobile.tonemapperfilm and shot a screen.
5. Build an IOS version.
6. Launch it on a device and enable r.mobile.tonemapperfilm and shot a screen.
Compare the two shot screens.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-74688 in the post.