I am trying to scan pdfs for a windows folder (shared drive) and I have Universal Capture >> Setup >> Retrieve Files as: folder where PDFs are and I have kept the 'Only retrieve files with the following extensions' as empty, as we will be having both PDFs and TIFF files in this folder.

But with 'Only retrieve files with the following extensions' empty, QF doen't import/scan the PDFs. BUT when I select 'pdf' under the dropdown for 'Only retrieve files with the following extensions' it then starts importing/scanning pdfs. Now the problem is, I can have 'pdf' selected as this way it will ignore all other files e.g. tif.

Am I missing any settings here? 

Screenshots attached.