Do exactly what it says, using its file explorer : choose i.e. select root (folder)... Of the external sd card
following instructions is often the best way to make stuff work
Alternatively, set moon reader to use internal storage for its folders then you will never have to humour android by doing the sd card root folder select thing. It's an android issue, not an app issue
Google search Android file storage permissions, or similar searches, for more background
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