Short Answer: Refresh the page and re-upload using 'Edit' or 'Upload file'; confirm your file is CSV/XLS/XLSX and under 100MB.
Answer
PreRequisites
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Original file still available
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Stable internet connection
Steps
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Check both 'VAT / sales tax statement' and 'Books / Books of accounts' cards for filenames.
You can see whether a file is listed or missing. -
If missing, refresh the page and try uploading again using 'Edit' VAT card or 'Upload file' Books card.
The filename appears after successful upload. -
Confirm the file format is CSV/XLS/XLSX and file size <100MB.
File meets the displayed requirements. -
If re-upload still fails, try a different browser or network and attempt upload again.
Upload succeeds or different error message appears for next troubleshooting step.
Troubleshooting
- Upload fails with 'unsupported format'.
LikelyCause: File is not CSV/XLS/XLSX.
Action: Export or save the file as CSV, XLS, or XLSX and try again.