Exporting Material, 3D Model, and UV Map from .FBX in Blender

Import .FBX File:
Open Blender.
Go to File > Import > FBX.
Browse and select your .FBX file.

Inspect Materials:
In the “Materials” tab of the “Properties” panel, you should see the materials associated with the imported model. Blender might import these materials with the same names as in the .FBX file.

UV Maps:
Switch to “Edit Mode” for your 3D model by pressing Tab.
Go to the “UV Editing” workspace.
In the “UV Editing” workspace, you should see the UV Map for your model.

Export Materials:
Go to File > Export > Material Library.
Choose a location and name for your .MTL (Material) file.

Export UV Map:
In the “UV Editing” workspace, select all (A) and go to UV > Export UV Layout.
Save the image.

Export 3D Model:
Go back to the “Layout” workspace.
Select the 3D model.
Go to File > Export > FBX.
Make sure to check “Selected Objects” if you only want to export the selected model.
Choose a location and name for your .FBX file.

Importing the resulting components into OpenSim or Second Life should pose no further issues.