How to set the output directory for exporting a pdf file with skim?

I am looking for an option (or something else) for the PDF viewer Skim (V1.6.8) on macOS (High Sierra): After modifying a PDF file (e.g. adding a note or highlighting a part of it) Skim enables the possibility to save (export) the PDF including the embedded notes such that no additional .skim file is produced. Invoking **File** > **Export** for the first time a panel opens where the file including the PDF notes can be saved on disk. Unfortunately, the suggested folder in the panel is set to the last folder used and not to the 'active' one where the PDF file is. Does anybody know how to adjust the folder automatically in order to shorten the workflow? Of course, after a second export of the PDF file the folder is set to the right one. Is it possible to avoid this behavior?