When creating 1-To-1 you have the option to save the draft and continue editing at a later date. This article will cover where and how to access those emails.
*NOTE* Saving a draft in a 1-To-1 email is specific to the contact and will only be found under the contact.
To access a draft select the "Email" category from the contacts dashboard.
To the right side of the screen select the dropdown and select "Draft" this will display all 1-To-1 email drafts.
Select the plus sign to the left of the email to expand it, then select edit on the right side of the email and select "Edit".
Once "Edit" has been selected the email editor will be reopened with your draft. From there you can continue to write, edit, schedule, or sent the email.