Why test data matters
If your recording filled in forms (names, NHS numbers, postcodes), every virtual user will submit those same values unless you provide unique data per user.
Synthesise data
The platform generates 200 plausible rows from the field shapes it captured. Good for generic forms. Will fail on referential fields like NHS numbers or patient IDs.
Load your own data
Upload a CSV with one row per virtual user. Required for any field that references a real record.
No data fields?
If your recording is GET-only (browsing without submitting forms), no data question appears.