Dragging data files to the main Tellico window and dropping them will import the files, just as if the import command was made from the menus. Drag and drop works for the following file formats: Tellico, Bibtex, RIS, and PDF. Importing multiple files at once is also supported.
So, for example, if you want to catalog several PDF files, select them in the file manager and drag them to the Tellico window. Tellico will import as much metadata from the files as it can, and then fetch additional information from various configured Internet sources.