Hi there,
yes, you can use the emmc as storage. thanks.
respeaker@v2:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mmcblk1 179:0 0 3.5G 0 disk
mmcblk0 179:16 0 14.9G 0 disk
mmcblk0p1 179:17 0 100M 0 part /media/respeaker/BOOT
mmcblk0p2 179:18 0 14.7G 0 part /
mmcblk1boot0 179:32 0 2M 1 disk
mmcblk1boot1 179:48 0 2M 1 disk
mmcblk1rpmb 179:64 0 512K 0 disk
respeaker@v2:~$