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FAQ for launcher developers
This happens because your launcher does not support the Icon Pack Studio format.
Icon Pack Studio exports the user creations using one of the most common icon pack formats in Android.
If your launcher supports Icon packs downloadable from Google Play Store, it probably already supports Icon Pack Studio, you just need to be sure your launcher searches in the file /res/raw/appfilter.xml to resolve the icon resources ids.
Just use this piece of code to launch the Icon Pack Studio editor.
val intent = Intent("android.intent.action.PICK")
intent.putExtra("packagename", <app packagename>)
intent.putExtra("activityname", <app activityname>)
intent.putExtra("userid", <app userId or -1>)