I'm having a really hard time importing PDFs into the Research folder.
For some reason, the default seems to be to convert PDFs into RTF -- but since these are academic journal articles heavily noted and marked up in Okular, converting to RTF results in gobbltygook.
But I've been unable to find where I can turn off this bizarre auto-conversion. I must be missing something obvious, but I just can't find the option.
How do I import PDFs as just simple, read-only PDFs, without it trying to turn them into something else?
edited to add: Or linking to it, instead of "importing" it would be just as viable a solution

Thanks!