Thank you for attaching the screenshot as this way I can get a better overview of the situation.
The orientation is written in the EXIF of the images and that is why I would first import the images into Pix4D and use the “To File…” option that will export both image geolocation and orientation. In the further steps, it is then possible to combine the .csv file generated in Pix4D with the one from Propeller Aero.
I provided the reply in the Phantom 4 RTK - PPK processing as it is more related to the question. If it is OK for you, we can continue the discussion about the workflows related to the PPK procedures there.