Not working

Don’t know what’s happening – tried simple ytube url in text mode, tried with embed shortcode, looked for a button in the visual editor… – only a white space shows up with simple ytube url text mode.
Reading the previous posts it seems that the instructions are a bit outdated, since there is no auto-embed feature to be enabled anymore.

Is this plugin still maintained?

https://www.ads-software.com/plugins/responsive-video-embeds/