nRF Mesh DFU over the air

Hello,
I'm trying to set up the DFU over the air mesh. Using the mesh SDK 5 and nRF SDK 7.1.0.
Using the DFU example from nrf sdk17.1.0, I successfully ran it.
When I tried to execute the DFU example located in mesh_sdk5, I cannot find my board via NRF connect app and cannot send a DFU package.
After reading some documentation, I have not been able to add DFU features to my application.
How do I add DFU over the air to my mesh network application?
Is it necessary to use the DFU bootloader and then add the application that uses buttonless DFU over mesh on top of it?  If so, how can I connect all this in Segger studio?

On nRF52832, I am using NRF SDK 7.1 and mesh SDK 5.

I appreciate your help in advance!

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