Hello.
Could you also add .opus extension to the supported file types of metadata pane? As far as I understand opus stream is usually wrapped in ogg container, that is supported by Dopus and the reason that the tag data is unaccessible in metadata pane is because it doesn't treat files with .opus extension as supported. Below I've posted a link to my massage in another topic where I tested different file extensions with metadata pane and although now I think that adding .aac and .fla file extensions is a little bit excessive .opus still seems like a valid candidate for supported extensions.