Error
In some cases, you (or the designer who created the file) might have forgotten this requirement or the files might have been created before you decided to adopt Gelato, using a different bleed setting. In these cases, our platform can automatically detect the bleed issues with your file when you upload and prompt with a warning message to fix the issue.
Solution
Revise the file with 4mm bleed on all four sides of the document and upload again.