External content in A/B tests
You can add content connections to email messages that you send as part of an A/B test. The external content that is connected to the winning split is the version that is included with the final mailing.
A/B tests often determine the winner at least in part that is based on differences in content. It is important to consider when content connections retrieve content in each A/B split. If any of the splits link to content that might change during the A/B test, plan content retrieval to ensure that the correct content is included in the test.
The start of the split does not affect connections that are configured to retrieve content when the message is published. You must publish the email communication before you add it to a split. Changes to content after you publish the message are not included in the split results.