Grab the url for the information sheet by opening it in view (not edit) mode. E.G. for Anthophora plumipes the whole url is:
https://www.bwars.com/sites/default/files/info_sheets/05_Anthophora_plumipes_1col_infosheet.pdf
Then, copy this part of the url:
/sites/default/files/info_sheets/05_Anthophora_plumipes_1col_infosheet.pdf
(That is everything after the initial http://bwars.com part of the whole url).
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