Same here can't even get it to work and retroarch is a joke , I can't use duckstation and espxe both for launchbox android , Luckily i only paid $15 for year i think i'm not going to upgrade/renew after this year because i have so many problem setup with other emulator , I'm gonna say not all ppl like retroarch .
I purchased launchbox android version because i want to put games on Nas for my shield tv pro but i have too much issues for this something like "beta" version .
Just get arcbrowser and much more friendly for android (If you don't need games running on Nas for shield tv) , You can customize lots of stuff like platform video / startup screen / game video thumbnail.