Arduino SAMD boards (Zero, M0, MKR, Nano 33 IoT) are supported 'out of the box'. Additionally to upload over the internal flash as temporary storage, upload over SD card and over MEM shield's flash is ...
Open File → Preferences → Additional Boards Manager URLs and paste: http://drazzy.com/package_drazzy.com_index.json arduino-developer.com Open Tools → Board → ...