File Link File Append .... Library .. Material and Texture Reuse Animation

Hello.
Thanks for Reading.
Can a material and texture be reused and animated?
I want reuse and consistency across files … to a large extent.
I want to animate texture influence differently in the additional files. In addition to armature.
Of course I do not expect to be able to exactly indicate which numbers are modifiable and persistent … and which are not … since I have not seen and example of this.
Via File Link File Append … Library.
Must the user create a full copy of the original file?
In file BlendSource a Armature Mesh Materials with Texture influence animated was created.
Group created for append link.
In file BlendTarget the Armature and Mesh are linked from BlendSource via Group.
A proxy is created to the armature in Blend Target and functions as expected. Success/
The linked mesh. Controlling Empty. Material Pane Absent.
Next.
A proxy for the mesh is created. The modifiers are absent. Material Pane Present.
Texture Panel is present but is not modifiable. The UI for texture is visible and not operational, not modifiable.
Failure.
Any suggestions to get the texture panel operational?
Is this reuse possible?

Thanks.