OilGrass

Yes guys. Thanks edenranell, you are right.  I found the solution, too.

After you choose embed, paste in the URL.  If nothing shows up, click the "</>" next to the url white space.  That actually opens up a blank code box.  Copy the code of the object you are embedding and apply.  You will see the display say "Script disabled."  But don't worry.  Open a new window in another browser with your account logged out and visit your page.  you will see the object showing.  This is actually found in Squarespace's help section as below:

1. Enter the URL of the item you're embedding. You'll need a URL from a site that uses the oEmbed standard.
2. If the content doesn't appear, click </> in the block editor on a computer (or Code in the Squarespace app) and paste an embed code manually into the text field.  

https://support.squarespace.com/hc/en-us/articles/206543617