I tried to add different documents on my Kobo, as Dalede suggested, but the "documents" section was still unavalaible and the files didn't show up anywhere else. I decided to reset the device to the factory settings. Hopefully, it restarted on the 1.9 version. All my previous books needed to be uploaded again, but it worked: the library PDFs finally showed up under the now available "documents" section.
What a pain for just this... but better late than never I suppose.
Thanks guys for your advices.
