I recently bought a Chromecast with Google TV HD to replace an aging 2nd gen Chromecast. I was excited to use emulators on it as a bonus but have had no luck thus far. Whenever the emulators (Lemuroid, Redream, M64 FZ, Drastic) ask me to point them towards roms I get a "you don't have an app that can do this" error. I have had various file managers such as X-plore and FX installed but yet still get this error. I have made sure all the apps have permission to access files and media. I keep the roms on portable USB storage which I can see the file managers can access. VLC also has no problem accessing these files. What do you think the problem is?
EDIT: Added Screenshots. Some apps won't let me select allow access to files all the time. Others that do still get the same error. Apps with their own file browsers work fine, such as Drastic, but any app that needs to use a separate file manager gets the same error. FX is installed and set up in all these screenshots.
Just tried Drastic on ADT-3 running 12 and Shield 2015 running 9, and it would seem the barebones built-in file browser doesnt allow to navigate to external resources at all. Not even on Android 9; there is just no option to change drives. So here's that.