How do I move one of my existing outbound messages into a Series?

Hey @virginie b👋 It looks like you are not currently in Edit mode, you'd need to select Edit mode and then the option to Copy existing message into Series option will appear 🙌

When building a Series, you can select Copy existing messages in series from the More drop-down menu:Then, select the message you want to copy from the list:Your message will then be copied, with its filters added as a Rules block: