Mesh flash manager demo nrf5_SDK_for_Mesh_v4.1.0_src

Hi, I want to store some personal data through flash in the LPN mesh routine. I read some posts and can be implemented by using flash manager, but I can't find the relevant demo in the  nrf5_SDK_for_Mesh_v4.1.0_src . Can you provide a demo example in the  nrf5_SDK_for_Mesh_v4.1.0_src version? on the other way,move fds to the mesh , ,fds_init ret=34314 not 0,not NRF_success ? hope your reply。

add fdserror