I am trying to add the embed code to the new document using html editor and able to see the content, however when i am trying to publish the document it gives out error " This document needs some content "
also i tried the the same using HTML and Formatted Text widget the content only shows while i am in editor mode, as soon as its saved it doesn't show anything
looking forward for resolution
and some others i forgot will be displayed when creating a content but will disappear as soon as you publish it.
i can't tell you more now, haven't got much time at this moment
by the way you can disable those kind of protections if you got jivex i think. not sure.