★When exports .dgn file format in ZWCAD, it prompts "Requires 3D seed file", why?

Issue:

When exporting the drawing to .dgn format in ZWCAD, there is an error prompt of "Requires 3D seed file". How to deal with it?

Solution:

1. Click the menu File → Export (EXPORT command) to open the Export dialog box and select the DGN file format.
   
2. In the Export DGN Settings, select the file containing Seed3D field in the Specify seed file, and then output it.