While we are migrating the remaining features from the legacy Messaging page to the new Campaigns page, you can use the following workaround to create a user audience with a CSV containing user IDs:
- Create a Webhook message in the Messaging page. Leave the URL field empty.
- Upload your CSV list for audience targeting. Please check our docs for the limits and details first: https://docs.leanplum.com/v1/docs/user-id-list-targeting-beta
- Send the webhook. The users won't experience anything, but the Sent event will be tracked in their user profiles
- Finally, you are ready to setup your actual campaign and target all users that received the empty Webhook. Example audience:
Total occurrences of <Empty Webhook> Sent is greater than 0
*Always make sure to select campaign events from the autocomplete menu, instead of typing the entire name manually