If your PDF invoice is rejected with the reason Document not eligible, this means it was generated from a scan or a photo.

SY only accepts PDFs created digitally from software (Word, ERP, etc.). A file produced from a scan or a photo — even if saved as .pdf — cannot be processed and will always be rejected.

How do I fix this?

Export or generate your invoice directly from your invoicing software or ERP as a PDF, then resubmit it.