I installed this plugin in the mu-plugins folder.
As an admin, I can paste my embed, update post and it works. But when I go to the visual tab and/or update again it strips the code again.
So basically, if I paste the code and save right away it works. As soon as I edit, it strips the code.
Second issue, only admins can do the above (it only works half way). The other users can't. This may be due to a role/default role setting.
*UPDATE*
I tried a youtube video instead of a google form. It now lets global admins to go from visual/html tab and the code stays.
However, regular users code gets stripped. What can be the problem?? It says they are admins of their blog!