After you create a Large Segment and create a Large Segment definition for Environment, you can upload keys using the Change Requests endpoint.
Updating Large Segment keys is done in two steps:
- Use the Change Requests endpoint, to get an UPLOAD URL.
- Use the UPLOAD URL to upload a CSV file containing the Large Segment's full list of keys.
You must upload the full list of keys (can be 1,000,000 keys, according to the Large Segment size limit) because the change request will create a new version, overwriting the previous Large Segment version.
For full instructions, go to Open Change Request to add members to a Large Segment.