Primary storage option for BMPCC4k?

As the title suggest, is there a way to set primary storage options? I have a external SSD and a SD card for luts that I would like to have readable by the BMPCC4k. But it seems like I only do on or the other since one of the storage spots is held by CFcard option.

You can use SDXC or CFast 2 and external SSD. via the USB-C connector. You select in a menu which item will be preferred and when that SSD media card for example is full, the camera will automatically switch to either SDXC or CFast2.