Note: This video seems to suggest the U1 will remember the measured K factors until you unload filament. This appears to be the original intended behavior.
However, engineering confirms that after the print where they are measured, any request to change the PA factor on later prints will override that setting. And the default slicer behavior sets it to the value in the material profile.
So the default behavior does not use the measured dynamic flow calibration for anything other than the immediate print.
A tip for more advanced users: Personally, I would suggest monitoring the printer’s command readback in the fluidd web interface while the dynamic flow (pressure advance) is measured by the U1. It will tell you the answer as each measurement finishes, which can be saved in the material settings for your Snapmaker Orca profile for future use and give you a better default value without needing to measure it again later. The result is actually pretty good.