Hello @MargotD. I'm sorry that you're not able to find your saved templates. Do you happen to remember the name of the template or when you saved it? If you have any additional information about your saved templates, this could certainly help us find out what happened.
When you were brought over to our new Toolkit platform, we did remove some templates that were outdated. We are moving towards making all of our templates be mobile-responsive as well.
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