New contacts cannot be uploaded directly into a segment. Instead, you should append new contacts to the parent list for that segment – if the contacts meet the query criteria, the segment will update automatically.
- Navigate to Contacts > Marketing Lists, click the drop-down arrow, and choose Import/Export
- Select Append to this List, and follow the prompts to upload the new contacts
- Once appended, contacts will fall into the appropriate query segment – check your segment and query logic to confirm