He tenido que realizar un downgrade a la versión 6.5 para poder acceder a las carpetas de oruxmaps tanto en el teléfono como en el PC.
Parece que la nueva versión del programa se instala en alguna zona protegida.
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I have the same problem too. I installed Oruxmax version 7.0.x on an Android 7.1 phone and I can not see the Oruxmaps folder (or its subfolders). Neither from phone with Android browser nor from PC with Windows explorer.
I have had to downgrade to version 6.5 to be able to access the oruxmaps folders on both phone and PC.
It seems that the new version of the program is installed in some protected area.