External storage options that are solder mounted

Is there any external storage options that doesn’t use the NVMe connector but uses the same comms line? My application requires non-removable memory and the 16GB emmc is not enough.

I would perfer if I can solder mount it would be ideal for my application.

No external eMMC is supported.

On the data sheet it says the SD/MMC controller (supporting eMMC 5.1, SD 4.0, SDHOST 4.0 and SDIO 3.0)

Couldn’t I find a storage that has eMMC 5.1 support and use it there?

Please refer to the Product Design Guide in which it has clarify only SD card/SDIO is supported.