Hi Till,
I think the reason why you cannot import the values is that the orientations are missing.
When importing accuracy values, the files also needs to include orientations (Input files article):
- imagename,
- latitude [decimal degrees] / X,
- longitude [decimal degrees] / Y,
- altitude [meter] ,
- omega [degrees],
- phi [degrees],
- kappa [degrees],
- Accuracy Horz [meter],
- Accuracy Vert [meter]
If you do not have the omega, phi, kappa angles, you can try to get them as mentioned in the Phantom 4 RTK - PPK processing post (see item b).
Best,