SL-19005 Fix 'save as' button for local uploads

indra/newview/llmaterialeditor.cpp

@@ -2157,6 +2157,7 @@ void LLMaterialEditor::loadMaterial(const tinygltf::Model &model_in, const std::
         openFloater(getKey());
         setFocus(TRUE);
         setCanSave(true);
+        setCanSaveAs(true);
 
         applyToSelection();
     }