To quickly send an image from your Collection, first navigate to the Collection you're working on. In your Collection select one or multiple images, then click 'Email' in the toolbar at the top of your page.
Note: This will only send a ZIP file containing the selected images to your client. To email your client's full Gallery, click on Publish to create a new Gallery for this Collection, or Galleries & Apps if a Gallery has already been published.
After selecting 'Email' you can enter your client's email address, customize your ZIP file settings, and then send it off to your client! ✉️