media_upload_{$type}

Fires inside specific upload-type views in the legacy (pre-3.5.0) media popup based on the current tab. The dynamic portion of the hook name, `$type`, refers to the specific media upload type. The hook only fires if the current `$tab` is 'type' (From Computer), 'type_url' (From URL), or, if the tab does not exist (i.e., has not been registered via the {@see 'media_upload_tabs'} filter. Possible hook names include: - `media_upload_audio` - `media_upload_file` - `media_upload_image` - `media_upload_video`