Partition data subtype

[PeterR]

I want to store a large website's pages (.html, js etc) in its own partition. Its just too painful to flash along with the application especially at the rate I insert bugs.

I am using the lwip file system, SPIFFS is to slow.
Which partition and subtype should I use?
I am assuming data but which subtype?

I have found code examples which use values > 0x80 for subtypes fatfs, spiffs etc which is at odds with the documentation https://docs.espressif.com/projects/esp ... ables.html which states that data partitions have subtypes 0..4 and that other subtypes are reserved.

EDIT: The file system is a large 'C' data structure. I want to hold the create data structure in myapp/components/httpfs. I cannot see how to create 2 binaries i.e. the main application in myapp/main and the webpage binary in myapp/components/httpfs/main
I don't want to jump to CMake just yet.
Using a script to cd to the (webpage) subdirectory and then 'make app' is close but builds all the ESP-IDF components. I want to compile and link the data structure in fsdata.c, locate at an address and not remove 'unused' sections.