Controls whether the importer searches the entire project for textures.
Legacy behavior. When enabled, the importer performs a project-wide search for textures if they are not found near the model file. This can produce non-deterministic results when multiple textures share the same name.
When disabled (the default for newly imported assets), the importer only looks for textures in subfolders called `Textures` within the same folder as the model or in parent folders.
Existing assets imported with previous versions of Unity retain this as enabled for backward compatibility.
Additional resources: materialImportMode, materialSearch.