Hi,
This plugin was not implemented on mobile. I never tried it on iOS but I tried it once on android and it didn’t work.
I am guessing some configuration is needed to make obsidian handle *.org files.
Since I don’t use obsidian on mobile, I didn’t look at how to make it work.
You can disable a flag in the manifest.json in your .obsidian to activate the plugin on mobile as described in Hacking Obsidian: Making a Desktop-only Plugin Work on your Phone or Tablet | Medium but it will probably still not work.