Drag & Drop is not working.

Dear Support team,

Thanks a lot for this nice plugin. We use this plugin on this page: https://sauer-motorentechnik.de/dienstleistungen/austauschmotoren/?nowprocket and when the user drags any files and drops it in the area then the file is not uploaded instead the file is open in a new window. But when the user uses the ‘browse file’ button then the file is uploaded properly.

only the drag & drop option is not working and showing the JS error in the browser console. Do you have any idea how to solve this problem?

Regards,
Ashiq.

The page I need help with: [log in to see the link]