Android apps with obb files

Has anyone run successfully an android app with an obb file?

(I am not 100% sure if I am answering your question)

I am running the OsmAnd map app on my Sailfish device. The downloaded offline maps (*.obf) are stored in /home/defaultuser/android_storage/Android/obb/net.osmand/.

On the other hand, my phone has no *.obb files.