Web Snapshot Extension
Web Snapshot extension requires you to enable it manually in Safari app.
1 In the system sharing panel, tap the rightmost More button in the action extension bar.
2 Find Web Snapshot in the list, and turn on the switch on the right side, then tap Done.
3 Tap Web Snapshot to launch the extension.
4 Tap Save to save full web page screenshot.
5 If the extension is unable to load the web content after launching, it may be that your phone still doesn't allow Picsew to access the network. Please go to the system's Settings application to see if you have authorized.