[Zubersoft]

You can also just import multiple times and filter on the file types you do want. For example, you can use Import->Batch Import, set the file filter to *.pdf, and import all the PDFs. Then you could do it again for *.jpg. If you want to get really complicated, that filter is actually a regular expression field, so you technically could do something like 

(?si).*\.(pdf|jpg)$ 

if you wanted to only import PDFs and JPG files.

Mike