Phantom 4 RTK - How to PPK?

What version of RTKLIB are you using?

You might want to try the P4RTK NAV file.

In RTKPOST did you enter the known coordinates and elevation for the base in the Positions tab?

I typically create a GPX file through GeoSetter and retag the photos so you don’t have to do any manipulation in the processing software. Does the P4RTK create events in the POS file? It would show up as a separate file being that you will have one full-track without events and another with them. If not then I would contact Aerotas.

This happens quite allot when comparing averaged coordinates between different receivers. This is why allot of people like to use CORS or VRS services, but I have never used them myself and have had no need to. How long was the D-RTK2 setup before you entered the coordinates and made it active? Does your site have a localization?

Hopefully someone can chime in that has a more similar workflow to yours, but here is a thread by @GregO that may help.
How To - PPK Processing with RTKLib (Phantom 4 RTK)