Adding external maps to locus

I downloaded the last locus version. I take the maps I use from the Mobile Atlas Creator then I copy them to a volume of my tablet named external_sd. To use them in Locus I have to add them to Locus, as it`s not on the default directory. This worked by tapping a "+" area on the map lists in the previous version. I did not find any way to do it on the new one. This + is no longer present and nothing seems to replace it. Threre seem to be a new way, telling Locus to add a directory, but this does not work. The new maps do not appear. Fortunately, I keep the older versions of the softwares I use, and I could roll back to the previous version, but it would be better if the next versions makes possible to add external maps.