[Chen]

That's happening because you'e referencing the page numbers in the book, not the page numbers in the pdf file that makes up the pdf. If the book pages are 596-597, the pdf  file pages may be 234-235.

Yes, i understand that - it is just that MSP displays the "correct/relative to the start of the book/absolute" page number while browsing through the songbook, and expects the "relative to the start of the chapter PDF" page number when creating the snippet. This relative number of the current page is not shown anywhere (and MSP pre-populates the "wrong" absolute number in the dialog).

It would be nice if MSP would either visibly adjust the page number (596) to match the position in the current file (234), or hide the fact that this is a multi-file-song altogether from the user (and recalculates the appropriate offset from the given absolute number).

As it is now, i don't know how to find out which relative page and in which relative file the currently displayed page is.