It is possible to reload shelf resources if they are imported into your project. (right-click and choose "reload") If you imported it in the session or on the disk, we don't support the reload of them yet. Note that reloading the asset in the project won't update the layer using it, you will have to use the resource…
Just want to double confirm this: There are currently no way to reload material in SP right? I can choose to import an updated material as a separate material, but not update the original material when SP is open, correct? Even replacing the original sbsar file and re-apply material won't cause SP to reload AFAIK. Only…