I just installed emacs for Android from the fdroid store. I do not see a way for me to grant storage access to my local device. Without that permission, I don’t see how I can edit files, particularly org files, on my local device
I will put a screenshot of my apps permissions in a comment.
I dunno the answer to your question but maybe use orgzly on android instead. It mostly works OK but to be honest, I mainly only use it read-only. I use syncthing to synchronise to linux org files.
Also - how the heck would you use a keyboard-driven application like emacs without a (proper) keyboard? It sounds like punishment.