Attachment Not Getting Sent

We want to send a Word file with the automatic message that goes to someone who filled out the form (XOM Onboarding). The users get the email but not the Word attachment. What could be blocking the file?

Hi, thank you for contacting support.

I have sent a test submission to your form and I was able to receive the Word attachment.

I have now cleared your form cache. Could you please recheck and get back to us if the issue persists

We look forward to your response.

Thank you.