I deleted Sandbox:myPage---I don't think there's a Sandbox namespace, and it seemed to be just attracting random edits. Let me know if you need the content.
Topic on User talk:Wladek92
I tried to test a use of Sandbox to verify a call to a pre-template but it is to risky. One minute later half of my works has been cleaned by a Hello world page. So I dont know exactly when sandbox is useful, how long integrity is confirmed, etc... and I prefer to mount temporary sub pages under my User: . So dont worry Clump, all is ok.
Christian FR (talk) 17:12, 23 January 2020 (UTC)