New android version is out, still in test but i'm able to save and export. If you have some bug, leave comment on this post.
All save is done in the download folder in the root.
Some phone need to add permission manually. Setting-> App -> Tile2Map -> permissions and enable storage.
I test it on some phone and it's work :
LG G3 (android 6.0
Samsung Galaxy s7 edge (android 6.0.1)
Asus Zenfone 2 Laser (android 6.0.1)
Acer iconia 7 (android 4.4.4)
Chinese model UM-A75 with a20 cpu (android 4.2.2)
Plz leaving comments on this post with you cell model and if it work