Launching NextGIS Mobile from ODK Collect

I would like my ODK form to include the ability to launch the NextGIS Mobile app and have setup the form to include the following line:

<input appearance="" ref="/ABQ_Form_Tester/r1/g2/gid">

I assumed that was the correct intent as this is what the Android launcher indicates, but when I tap the launch widget it doesn't open anything. I looked up the manifest and also tried and, neither worked. I assume there is something simple I am missing - or is it not possible to launch an app without involving any data passing between the app and ODK?

You can't launch any activity form another app. Please look how it works here: and here there we have activities with appropriate filters in your case there is only MainActivity.