Add a content page to the chapter you wish to edit.
Add Page Title and page details. Save the page
Select the Page you just created and click on the Files Tab.
You then have the option to drag the file onto the Tab page or click on "upload Files' to select the file.
Once the file is uploaded click on Done
Select the Editor Page.
Select the Insert Video button and select the third icon - Browse.
Shared videos will now show up in the Manage Videos window.
Select the video by clicking on the '+' button.
You can then resize the video by selecting it and dragging the corner arrows.
NOTE: If you have videos stored in YouTube or Vimeo, you can click on the First Icon "By URL" button to add the video URL information. There is no need to add it to the FILES tab.