I would like to increase the internal storage by linking to the external SD- card. I am just installing navitel (Android) which consumes 1.2GB of internal storage. I created as root a link 'NavitelContent' from the Android storage '/data/sdcard/' to the external vFAT SD -card '/run/user/10000/media/sdcard/NavitelContent' and installed navitel. However, when running navitel I tells me that some files were not installed. I assume that there is a problem with the permissions. Any idea what could be wrong and how to fix it?

Remark regarding offline navigation: I'll try navitel, although it cost me 13 Euro. navfree has terrible routing and I do not get any audio from OSMAND (I tried all settings). I tried to sideload Sygic, but it seems to rely on the Google framework, which I try to avoid.