Yes and no!
- You can alter the custom fields in the email up to 5 minutes before the send is scheduled to go out.
The Landing Page
- You can alter the landing page before the send goes out or after. Even if the send is already in your recipients inbox the landing page will update
- We do not recommend altering the video in a scheduled send and instead would recommend canceling the send, changing the video and/or intro theme and then rescheduling the send.
We recommend to cancel the scheduled send, change whatever you need to and then schedule your send again. This will ensure that nothing including the videos will be messed up from the change.