Hey @denis t​! It's no longer possible to migrate an existing auto message to a smart campaign. As a workaround, I'd suggest first migrating your campaign to a Series, then adding the message to the Series.

Will try and let you know about the results. And I guess that because of that it is better not to use all campaigns at all and just use the Series?

Yes, I'd absolutely recommend using Series in future. We plan to deprecate campaigns in favour of Series in six months' time, and a Series will provide you with many more options than a standard campaign!

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