Multi-part Content-Type auto-detect is not working

OS: MacOS Sonoma 14.5

Yaak version: 2024.6.6

When I try to send a file using the Multi-Part body type, it doesn't set the Content-Type correctly automatically. If I select a JPEG image, the Content-Type received by the server is undefined, but I would expect it to be "image/jpeg" by default.

I know I can manually set the Content-Type, but doing so for each individual file is not ideal. I expect that if I leave Content-Type empty it should correctly guess the file type because that's what the popover says.

Thank you!