[fziegler]

Thanks for that - nice idea, too! 

In fact, my job comprises music edition and making music at the same time. Worst of all: Both parts overlap. So my solution wouldn't have been to sync the whole sheet music I have on my NAS to my poor tablet - only selected portions of that. But I could consider that way, as well. There's enough space on the SD card.

Your first sentence obviously isn't true as I now found out: It seems to be only true as long as you use Import > Local File and not Import > System File Manager. That's what I encountered. Always wondered about those different approaches. Now I know.