www.dl2rum.de

It's all integrated in RUMlog. See Menu-->Transceiver-->Audio #1/2. You just have to create virtual audio cables using a tool like Sunflower or BlackHole.

https://dl2rum.de/RUMlogNG/docs/de/page ... erver.html

Feature: Quick transfer of contest QSOs to regular log. While they can be exported as ADIFs and imported into the "main" logging data, it would be great if there was a menu item "upload to main log" in the "upload" section of the contest menu when in a contest log. There no export from the contest ...

And for the control window?

Please provide screen shots, also from the Rotor Control Window. This one shows helpful status information.

You should post all relevant settings.

Your screen shot shows the logbook preferences, not the contest preferences.
When the contest window has the focus, go to: Menu-->Contest-->Contest Preferences-->Network

It seems to be a common problem due to different interpretations of the standard. Apple writes here: https://developer.apple.com/documentation/foundation/nsurlcomponents/queryitems?language=objc RFC 3986 specifies which characters must be percent-encoded in the query component of a URL, but not how ...

Thanks for the hint Doug.
In fact, RUMlog fights with this problem since the beginning. I have to dive in it in again.