Drag and Drop in windows 11

I have just started using windows 11 and have noticed I cannot drag and drop files directly onto the mkvtoolnix app like I used to be able to in windows 10. Is there anything I need to setup to get this working. I can drag and drop onto other apps but not mkvtoolnix. This is rather annoying.

Welcome!

Works just fine here. Usually when drag & drop between two programs doesn’t work in Windows it’s due to one of the programs being run with different privileges, e.g. MKVToolNix GUI might run with admin privileges but your Windows explorer is running without or vice versa.