> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.booko.nl/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Upload failed

A file shows **Failed**, or you see an error while uploading? It's usually the file itself. Go through these checks.

## Check the file

1. **Type**: only PDF or images (such as JPG, PNG, WEBP, HEIC, BMP, TIFF). Word, Excel or zip files don't work as invoices.
2. **Size**: up to **10 MB per file**. On **This file is larger than 10 MB.**, make the file smaller or rescan it at a lower resolution.
3. **Contents**: **The file contents are not a supported PDF or image.** or **The file extension or type does not match its contents.** usually means the file was renamed or is damaged. Open the document and save it again as a PDF.
4. **Empty file**: on **This file is empty.**, choose the original file again.
5. **Blocked**: on **This file was blocked by the security scan.**, don't upload the file again. Ask your supplier for a new copy.

## Try again

1. In the upload window, click **Retry all** to retry failed files.
2. Still not working? Refresh the page and upload the file again.
3. Seeing **This browser cannot securely check the file for duplicates. Try a current browser.**? Update your browser or use a different one.

## Good to know

- **Already uploaded** means the file is already in Booko. Nothing went wrong.
- Invoice listed under **Costs** but processing seems stuck? Use **Retry processing** if that button is visible.

## Still stuck?

Still not working after these steps? Ask for a colleague in the chat. Tell us the message you see, the file type and the size. Don't send the invoice itself in the chat.