Mounted partition can not detected in settings->storage
I'm porting Sailfish on a device without external SD card slot. By default the internal mmc was divided to 'data' and 'storage' in partition table. I've mounted the 'storage' partition (/dev/mmcblk0p27) on /media/sdcard/<uuid> by systemd service and it seems nothing wrong since I can access it in terminal, but can not detected in settings->storage.</uuid>
Is there anything incorrect with my mount location? It seems no error printed in log, how to debug it?