To Attach a Reality Mesh

In the Reality Mesh Attachment dialog ( Drawing > Home > Primary > Attach Tools > Reality Mesh ), click the Attach Reality Mesh icon.

The Attach Reality Mesh dialog opens.
Click the File Browser for Reality Mesh icon.
In the Select Reality Mesh file dialog that opens, select the desired .3mx file and click Open.
(Optional) Turn on the Attach and Apply Geographic Coordinate System check box.
Click OK.

Note: Instead of browsing a file, you can also directly enter the URL of the file.