Thanks nostr:npub1meyk3ppvz66gy0haeydx4hgw0aksml75e7w05jklrya46unp0wqs9fjpyt for the feedback. Stay tuned for the upcoming release. In the meantime you can tag someone if you paste npub of that user in format "nostr:npub". This note was written on Android app - you can click on 3 dots icon on a note and Copy note text to see the raw text.