To store PWWebMaps on SD-card in Android 8.1

[kolatravel.com]

Changed my tablet to SM-T595 with Android Oreo (8.1.0). In menu option Maps > Web Maps > Cache Options > Manage Offline Cache i cannot find my external SD-card. In Select Folder I choose /mnt, sdcard, Android, com.musk...Pro, files and it results in foldername: /mnt/sdcard/Android/data/com.muskotech.PathAwayPro/files/PWWebMaps, but it results that webmaps are still stored in internal storage. I checked this in 'My Files'. Also after restarting the tablet it is still the same. What do I wrong? I cannot select my real external SD-card in Select Folder options.

[kolatravel.com]

With thanks to another App I found the name of my external SD-card. You can find your SD-card under /storage and not under the header /mnt (like in older Android versions). The SD-card is not recognizable by it’s format-name, but has some kind of UID like EA7D-S745. So the route to the PWWebMaps folder is then /storage/EA7D-S745/Android/data/com.muskotech.PathAwayPro/files/PWWebMaps.
Problem is SOLVED. Happy navigating!