Good question, btw. And on 5.1?
On 5.1 I can choose SD (using SAF), but "main storage" is used anyway. [#153]
No luck on 5.1 either. The app still uses "main storage", not SD. Regardless of SAF...
I do confirm. Moreover, it actually makes use of "main" storage, not SD. I suspect...
%d may not work for longs. %ld should do.