1. Open Windows Explorer
2. Navigate into folder main/src/test/resources/pdfs/PdfContentImporter
3. Open JabRef
4. Create new library
5. Save library to folder main/src/test/resources/pdfs/PdfContentImporter
6. In the group view on the left: Click on "Add group"
7. Enter "test" as name
8. Click on "OK"
9. If no group is added, repeat steps 5 to 7 (another issue in JabRef)
10. Drag Baldoni2002.pdf onto JabRef table
11. Result: PDF added
12. Drag Bogner2019.pdf onto group "test"
13. After dropping: nothing happens

Expected behavior:

1. PDF is imported as in step 10
2. PDF is added to group test

Hint: Method org.jabref.gui.maintable.MainTable#handleOnDragDroppedTableView is handling the drop on the main table.