Due to the recent changes in the Android file system the transfer of the app data to the private folder in /Android/data/ directory will launch after the app update. When only a single app is installed on the device (the other Locus is not installed), the data transfer is simple:
one app (Locus Map 4.4.x or Locus Map Classic 3.55.x) is installed
download and install the update (Locus Map 4.5 or Locus Map Classic 3.56)
during the app initialization, you are notified of the app directory /Locus/ stored in the unsupported part of the internal storage:
after accepting it, you can select the private folder into which the data will be transferred - either in the internal storage or on the external SD card (can be significantly slower)
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Locus smoothly transfers all the original data into its private folder
the process may take a few minutes depending on the size of your data
after the app restarts, all is done and working as before