enclosed you will find a demo pdf I created with your program under Mac.
The goal is to use optional check boxes to get only 1 box activated out of 2 or out of 4.
In your program everything works fine.
If I open the crated pdf under Acrobat Reader on a windows PC it works also.
But If I open the pdf under the normal preview app on a MAC, it don't works: All boxes can be clicked on and off ---> the option fields are converted to normal check box behavior.
How to avoid this - I need the form working independent under windows and iOS/Mac.
Thank you for your answer!