Ability to choose from existing files when attaching pdf's to articles?

I would like to be able to choose an existing pdf's (already uploaded) as an attachment to the article. My path to PDFs is like files/documents with different sub-folders. I don't want hundreds of PDF's in one fileman-attachments folder.

I need to be able to choose the correct PDF in my subfolder as an attachment to the article.

Regards
Øystein