@bigheart3dstudio I tried that, also “cook everything”, in fact I have explored all solutions I found on the net!
But I just found the culprit 
. I was building for shipping since at the same time I send versions on the google play store, and it was the issue.
If I use development build (with “for distribution” unchecked) it works, my maps are correctly opened on the phone.
A big relief for me, I can go on and track bugs with prints without waiting for somebody to download from the store, check bugs, check log etc. I’m gonna save a huge time!
Edit: I just realize I’m responding to a very old message, sorry…
Edit 2 : The build mode must be “development” (haven’t tried debug or test) but also maps must be included