The file will not upload
Cause: Unsupported type, oversized workbook, or a password-protected file.
Fix: Re-save as .xlsx or .csv without protection, then upload again.
Data Preparation & Troubleshooting
Everything you need before and after uploading: how to arrange Excel and CSV data, what a successful first upload looks like, and how to fix the problems that come up most often.
Data Preparation
Prepare your data and make the first upload successful
Most failed generations come from data structure, not from the prompt. Run through this checklist, or start from a sample file that is already clean.
Recommended
- Use clear, descriptive column names
- Keep only one header row
- Use consistent date, currency and percentage formats
- Put each metric in its own column
- Remove blank rows and repeated total rows
Avoid
- Merged cells
- Multi-level headers or several tables in one sheet
- Mixed date formats or units in the same column
- Images instead of structured data
- Large empty blocks in the middle of the data
sales_data.xlsx
Clean and ready to upload
| Month | Revenue | Orders | Conversion |
|---|---|---|---|
| Jan 2026 | $42,800 | 615 | 3.8% |
| Feb 2026 | $48,200 | 688 | 4.1% |
| Mar 2026 | $51,600 | 704 | 4.3% |
Automatic check: 4 columns · 12 rows · no merged cells
Before you ask for help
Common upload problems
Six issues cover almost every failed upload. Check the cause, apply the fix, then re-upload.
Related FAQ
Columns are recognized incorrectly
Cause: Merged cells, multi-level headers, or several tables in one sheet.
Fix: Keep one header row, one table per sheet and one metric per column.
The data format is inconsistent
Cause: Mixed date formats, currency symbols or units inside numeric columns.
Fix: Normalize each column to a single format before uploading.
The chart result is inaccurate
Cause: Total rows counted as data, or duplicated records in the export.
Fix: Remove total and subtotal rows, then de-duplicate the raw table.
The file is too large
Cause: Hundreds of thousands of rows or many unused sheets and styles.
Fix: Aggregate to the level you actually chart, and delete unused sheets.
Required fields are missing
Cause: No date column, no metric column, or no category to group by.
Fix: Add the missing dimension or metric column before generating.
Help Center
Troubleshooting and FAQs
Recover quickly from the first failure. Search the issue, read the short answer, then follow the detailed guide.
Check the file type and size first — Excel (.xlsx), CSV and pasted tables are supported directly. PDFs and images must be extracted into a table before upload. Password-protected or corrupted workbooks fail silently, so re-save the file and try again.
Fix This Issue: Data Preparation GuideTrasforma ciò che hai imparato nel tuo primo grafico
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