@Tera Victor, in case this works for you like it worked for metagrafox, I took the .obb file that Unreal spits out after building a package and place it on the headset manually after the apk installs. It goes into a folder called “obb” on the head level of folders on the headset. In that folder, if you don’t see a folder with your Android Package Name, make a folder that matches that setting in your Unreal project. It can be found under the Platforms>Android section of your project settings, and is usually com.YourCompany.[PROJECT]. (Don’t literally type project, type in your project name, and whatever else you have in that section of your settings).
Then you place the obb file in there. What is happening for me is that I no longer get a black screen, but it crashes immediately. So I am troubleshooting this new path and hope to get it running soon.