I couldn't find this information anywhere. Is IDE debugging supported for the new Uno R4?
Hi @arod0405. It is not supported at this time.
The Arduino IDE 2.x integrated sketch debugger is specifically designed for use with microcontrollers like the UNO R4's RA4M1 that have an ARM Cortex-M4 core, so there is a good chance that it is possible to add such support.