Quick Issue report here:
The plugin uses semicolons to split file info but it seems that’s not always what is used, for me, Zotero seems to use colons as a delimiter for that field. I was getting the whole original string until I changed the code to colons and now it works for me.
Not sure where this is being determined (couldn’t find enough on the way BibLaTeX usually works, or if it’s something odd in my Zotero setup, but if it isn’t just me then perhaps there’s a more robust approach to the file field splitting.
For reference, here is a file field straight out of a test .bib export:
file = {Bonchi et al. - 2013 - Activity preserving graph simplification.pdf:/Users/orion/Zotero/storage/7X742TDQ/Bonchi et al. - 2013 - Activity preserving graph simplification.pdf:application/pdf}