Exporting from Modo

With the mesh object selected, triangulate the mesh by pressing Shift+T.

Next, select System > Preferences from the menu bar to configure the COLLADA exporter.

In the preferences dialog box, locate the Collada I/O section under File I/O. Ensure that the Save Triangles as Triangles option is checked.

Close the preferences dialog box.

From the menu bar, select File > Export As.

Select Collada in the Save as Type drop-down list.

Press Save.

With the mesh object selected, triangulate the mesh by pressing Shift+T.

From the menu bar, select File > Export As.

Select FBX in the Save as Type drop-down list.

Select Save.