This was said to have been working in 4.24
Unsure currently when regression was
If you use SM5 preview and play in mobile preview, it works as intended.

Steps to Reproduce
  1. Create a First Person BP project
  2. In World Outliner, select First Person Character
  3. Below that is Detail, select FirstPersonCamera from the list of components
  4. Under Post Process > Lens > Image Effects, increase the film intensity
  5. Launch on to Device (Android is fine)
    Result: Film Grain doesn't appear
    Expected : Film grain appears as it does in the editor viewport

This also can be reproduced by settling Editor Preview to Android ES3.1 or iOS and observing the viewport.

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By Design
ComponentUE - Platform - Mobile
Affects Versions4.25.3
Target Fix4.25.4
CreatedAug 11, 2020
ResolvedAug 14, 2020
UpdatedApr 27, 2022