I added the GCP file but the data seems to be processed without GCP. All the GCP were above 300 AMSL but after processing, it is in between 250-275 m. Also, there is a shift of 5-8 m with respect to GCP.
I have looked at the logs but it has clearly georeferenced the model but the results are quite different.
When processing with GCPs and split-merge, you need to make sure that the GCPs are evenly distributed across the model and that there are at least 3 GCPs on each submodel (passing an image_groups.txt file to guarantee this is also highly recommended). Splitting Large Datasets — OpenDroneMap 3.1.7 documentation
Or if you have the necessary hardware, don’t use split-merge when using GCPs.
You will not see the checkbox with GCPs in any case when using split-merge.