"This folder is already in use" (where to store mbtiles file?)
I dowloaded the OpenSeaMap's charts for the Baltic Sea from here: https://ftp5.gwdg.de/pub/misc/openstreetmap/openseamap/charts/mbtiles/OSM-mbtile-Baltic.7z , and extracted the file Baltic.mbtiles from that archive.
Then I used adb to create the folder
i9300:/storage/emulated/0/Locus/maps/ ---i9300 is my Samsung phone
and pushed Baltic.mbtiles to that folder
whereafter I opened my brand new Locus Maps Pro app in order to add External Maps. When I click on the + sign Locus shows me the filename and size and a green icon with text "tile" something. BUT when I select that file, Locus says "This folder is already in use. Try another one"
I then created
and tested whether Locus would find Baltic.mbtiles if I moved the file to these. The answer from Locus was always the same: "This folder is already in use..."
What to do?
(My phone has Lineage OS with Android 7.1.2)