Can't export PDFS into standalone

Hello!

I seem to be unable to export PDF files originally from Blackboard that have been saved to My Documents through Adobe Acrobat into Zotero Standalone. When I try to do this an error message pops up saying the file isn't in a selected format but I thought Zotero was able to work with PDFS. What can I do to fix this? Please let me know.

Thank you!
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