Android/IOS rendering preview doesn't work on UE4 source.

Hey there guys, I’m using gitHub UE4 source 4.24.3, and this is what I got! Mobile Rendering Preview not working! - YouTube I need to see android rendering in editor and create the game as as android! But apparently I can’t change the rendering preview to Android/IOS. And after I successfully exported as an APK, the look of the game looks like a PC rendered graphic, but on a phone! I don’t want that and it gave me headache for months trying to solve this! Is there any way to solve this? On Binary UE4, it works fine but that doesn’t matter as I have to use the source version for this project.