As user, I have my personal.bib and a collaboratively edited paper.bib (Refs #160). The paper.bib has configured a (separate) file directory where the PDFs are stored. If this is true, I would like to have to following behavior:

1. I copy an entry of personal.bib. That entry has attached a PDF A.pdf.
2. I paste that entry to paper.bib.
3. A.pdf should be copied to the file directory of library paper.bib

In summary: All attached files should be copied if original files are not reachable from new library. One needs to keep the relative path structure while copying (to keep the files field unmodified)