Well once u got the game from google play, your game files will be in Internal Storage-> Android -> com.beamdog.nwnandroid-> files-> data
Then you connect your phone to pc , giving access to copy files in.
Downloading the cep and ravenloft haks from our forum, you just drag and paste in your phones files.
There is no tlk folder in android data, so you just drag them in.
The haks foldera in android is named "hk" you drag the haks there.
Rest i just copied in data, others that are not existent.
Optionally, if for example u play arelith aswell(sorry for ad of the server) and u know that there characters are saved per key, you can change your key to your PC one in com.beamdog.nwnandroid-> files -> user -> nwncd.ini (also in pc).
I copied only the bare necessities to make potm work (no music, no photos etc).
If there is still something unclear please ask.