Just found this app while looking for an alternative for the stock Wireless Storage
of my LG G2.
Freshly flashed to CloudyG3 2.0, which is based on the LG G3s ROM, I discovered that LG removed this useful app
So I installed Samba Filesharing Server, first from the Play Store, but I was not able to access any setting in the app (see attached screenshot).
Then I removed it, to give a try to the version linked in the OP. Same problem with this one.
I saw in the app's comments on the Play Store that someone seems to have the same issue but on a LG G3.