Did you download the tablet version? You need the phone version. (They're basically the same; it's just that one's suited for landscape orientation (tablet) while the other is suited for portrait orientation (phone).)
Thanks for your answer
So i have a nexus 4 with photoshop, a nexus 7 with photoshop for tablet.... When i go to play store, the message appears about incompatibility with lg g3.
So i try to send the apk from my nexus 4 and it works...but i cannot Update it of course... Help please
That's odd. If you have both you should be able to install the phone version on the G3.
I have just try to install all version... But the play store say to me that i cannot install because my phone is incompatible... What i have to do?