To send a campaign to a list you already have (exported customers, event leads, offline contacts):

1. In the campaign flow, choose File upload as the audience.
2. Upload your CSV or Excel file as-is — SuperLemon detects your columns (phone number + any template variables) and asks you to confirm the mapping. No reformatting or sample-file matching needed.
3. Review the detected contacts, then submit.

Notes: numbers should include country codes; duplicates and opted-out contacts are excluded automatically.