I too am running into this problem. I’ve been able to navigate to a game by choosing Load Content > / > recalbox > share > roms > mame and then choosing a .zip file that I want to play. This seems like a pretty poor use case; choosing the game in EmulationStation should navigate RetroArch to the proper ROM. Hopefully a fix is coming in a new version of Recalbox soon.
I too am running into this problem. I've been able to navigate to a game by choosing "Load Content" > / > recalbox > share > roms > mame and then choosing a .zip file that I want to play. This seems like a pretty poor use case; choosing the game in EmulationStation should navigate RetroArch to the proper ROM. Hopefully a fix is coming in a new version of Recalbox soon. Thanks!