Messages app sync issue with iphone
Messages app in iphone doesnt sync with the message app in apple watch, need to delete sms in both devices individually. Looking for a solution for this issue.
Apple Watch Series 5, watchOS 6
See this, Keep all your messages in iCloud - Apple Support
However, understand that if you delete a message it is gone. There is no recovery, since they are no longer backed up, they are just stored in iCloud.
