The source data may be incomplete, malformed, or different from the format this tool expects.
Check the input hint, try a small sample first, and correct the source file before running the full job.
The preview can only use the rows, files, or fields provided in the current browser session.
Confirm that the full source was pasted or selected, then rerun the tool and review the output before downloading.
Some destination systems have rules that are stricter than a browser-local utility can infer.
Use the report as a cleanup checklist and verify the final file in the app where it will be imported or shared.