Adding offline map - defined path is not allowed
I'm trying to add downloaded external offline map to Locus but I'm not successful. I have placed *.map file to folder /sdcard/Locus/maps and when I'm tyring to add it to Locus, it results into an error "Defined path is not allowed" (CZE: Definovaná cesta není povolena).
What am I doing wrong? Thank you in advance.
Device: LG Nexus 5X with the latest Android 7.1
No external SD card, permission for read/write is granted.