Thank you for sharing with us the quality report.
I noticed that the GCPnamed mtp1 has a very large error.
Can you please delete it and select Menu Process > Reoptimize – Support? Afterwards you will have to process again steps 2 and 3.
Regarding the size of the orthomosaic you are importing have in mind that you can import the tiles of the orthomosaic one by one in GIS instead of the whole orthomosaic. You can find the tiles under this path: …\3_dsm_ortho\2_mosaic\tiles
May I ask also what is the exact software you are using? Is it QGIS, ArcGIS, etc.?
Can you please upload the orthomosaic and the tiles after you copress/zip them, on our OneDrive?
Please let me know when files are uploaded.