You should name it as egm08_25.gtx then it will appear automatically but if you use custom name then you have to manually edit vertcs.csv or create user defined CRS with horizontal and vertical system which references your geoid. Editing vertcs.csv is easier but you will lose edits after CC upgrade. That is why I recommend to just use default egm08_25 name as until CC gets delivered with EGM2008 it won't overwrite your custom geoid. communities.bentley.com/.../458045
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