Check it out: somebody used MSSR plugin in an AR app on iPad: https://twitter.com/LideTark/status/1217993491701088262
Steps to build MSSR for IOS, Android or other unsupported platform:
- Copy the plugin to your project: from UE_4.24/Engine/Plugins/Marketplace/MSSR to your project/Plugins/MSSR
- Edit MSSR.uproject file in your project and add the platform in WhitelistPlatform list. “IOS” or “Android”, etc. depending on your target.
- To avoid conflicts uninstall the engine’s MSSR plugin
- Rebuild your project