Thanks to @pierotofy, processing 100 images together with gcp_list.txt file on WebODM updated was successfully complete.
This is orthophoto tif file generated by processing on WebODM:
I checked whether absolute accuracy produced by processing images together with gcp file having 5 GCP points has been improved or not, by comparing coordinates of GCP points on the “Orthophoto” on QGIS program with “Actual” coordinates measured by GPS station. These are comparison of 2 GCP points among 5 points:
Coordinate System: WGS84 UTM54N
As mentioned above, processing was successfully complete. I wonder whether the coordinates of GCPs on gcp_list.txt improved the absolute accuracy of orthophoto or not by processing on WebODM.
This is gcp_list.txt file processed together with 100 images on WebODM:
For reference, the absolute accuracy of survey grade shall be less than 10 centimeters on X and Y axis here in UTM 54N.
Any suggestions and recommendations on this issue will be highly appreciated.