Sending printjob from OrcaSlicer not possible (no replies)

(copy from less frequented Repetier-forum)

I searched the internet yesterday and today but unfortunately didn't find a solution...

When I try to send a print job to the server from OrcaSlicer (1.9.0), I get the following error:

Error uploading to print host:
HTTP 404: Requested file not found.

The server (full version, Pi4-8gb) is connected via WLAN and can be easily operated from the machine with the slicer. The printer is (half) self-made with the latest MARLIN 2.1.x bugfix. In Orca I can see and control the server under the menu point "device".
So the connection over LAN/WLAN works well in both directions.
What I also wonder about is the error message "Requested file not found"... Which file? From where? Where?

EDIT:
Meanwhile, I can click on "Send & Print" but the file/gcode never arrives the Repetier server. And no: No error message or anything else. It just do nothing

What am I doing wrong here or what have I overlooked?


Greetz
Micha


PS:
Or let me ask it another way:

Which slicer works perfectly with Repetier on a Windows system?
Cura is already clear that the plugin specified in the FAQ has not been further developed since Cura 5.0 and cannot be persuaded to cooperate in Cura 5.5...