Storage SD card or eMMC flash memory

SD or eMMC flash memory


We have an edge device with inbuilt eMMC flash memory on raspberry cm3 having the capacity of 4 GB and a SD card slot where we have 32GB card inserted. I would want to understand how I can properly mount the image on the device. I have the mender image but I won’t be able to run it on an eMMC card due to the limitation of 4GB. However, I would want to mount the image on eMMC flash. Is it possible to make use of both the cards to flash the mender image?
Best, Akhil