Export Basic 3D Model (.OBJ/..MTL) with Only Modified Base Color

Newbie Help Request!
I am using Blender v3.5.1 …
I exported a simple primitive mesh (example: icosphere)
as 3d model legacy format wavefront .obj w/.mtl file
with edited base color.
Exported model has default (gray) color.
Saving file first resulted in no change.

I require wavefront .obj w/.mtl file export.
Not using texture/image file.
Just basic export must include .obj file w/.mtl
file modified color.
Not alternate file format.

Please offer a solution.

Welcome :tada:

You are using the legacy obj ex/importer … try the non-legacy-one… and don’t forget to select color:

A recent update to Windows 11 on my computer resolved the issue!
No need to alter default settings. Legacy Wavefront .OBJ/MTL export now successful.

Then Window 10 is really weird…