The following methods can be used to share Lockscreen Poster pictures:
1. Slide left/right on the lockscreen--Tap "…" in the lower right corner/upper right corner--Tap "Share" and select the sharing method--Unlock the screen, and you can share your Lockscreen Poster wallpaper with a friend.
2. Slide left/right on the lockscreen--Tap "…" in the lower right corner/upper right corner--"Settings"--(Unlock the Screen)--Wallpapers being used--Tap the wallpaper you want to share--Share--select the sharing method and send it to a friend.