Extensions.conf and sip.conf not linked in my FreePBX GUI

Dear all,
I installed an asterisknow server with is FreePBX GUI.
To setup extensions.conf and sip.conf I had to modify manualy files and this change are not seen in the GUI.
How can I check what is missing in my installation ?

Any help is welcome.

Those files are owned by FreePBX. All changes must be made in the GUI.

This is clearly noted in the notes at the top of sip.conf and extensions.conf.

You can hook the FreePBX dial plan with the contexts provided by FreePBX that include custom in the name.