booklet.pdf with multiple folders

[rompolompo]

The booklet.pdf feature works great with single folder albums. I have the following folder structure:

Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 1\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 2\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 3\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 4\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 5\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 6\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 7\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 8\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\Symphony No. 9\
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\cover.jpg
Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic\booklet.jpg

Each symphony has its own folder. Within each folder, there is a cover.jpg file as well as the FLAC files. Covers show on BubbleUPnP without a problem. I would like to avoid copying the pdf file (around 9MB) into each folder (symphony). Is there something I should change in the tags to facilitate this?