Send HTML email in Outlook 2016

I have created an HTML page with modified from a template I got.... I want to send as a HTML based newsletter in Outlook 2016.

However the guides I see as "insert as text" do not apply to Outlook 2016 as there is no dropdown for inserting files for that in the 2016 version.

I am wondering how I go about being able to send this HTML email?

The "insert as text" option is still available in Outlook 2016, but you have to un-hide the old "Attach File" button. Use that instead of the new "Attach File..." button on the ribbon.

From https://www.msoutlook.info/question/classic-attach-file-button:

1. File-> Options-> Quick Access Toolbar
2. Set the “Choose commands from” dropdown list to: All Commands.
3. Select the “Attach File” command.
   • Make sure you do not select the “Attach File…” command as that is the new menu button.
4. Press the "Add > > " button.
5. Press OK to close the Options dialog and return to Outlook.

Once you have the old "Attach File" button back:

1. Click the "Attach file" button in your Quick Access toolbar
2. Select your file ending in .html
3. Select "Insert as Text."