You can view your email at any stage of the creation and sending process. Emails in the Email Library can be edited after being sent, so this will show how to view the exact version of the email that was sent, even if changes have been made to it in the Email Library.
Clicking on the Email tab at the top of the page will let you see all of your emails. From here, click on the sub-tab Sent and click on the email you wish to view.
After opening your selected email in the Sent tab, you can view the email by clicking on the View Email feature. From here, you will see the email you sent and be able to download it as an HTML file.
You may need to reach out to firstname.lastname@example.org to ask to switch this feature on for you if you do not see the option within your email campaigns.