Fix Formspree File Upload Issue

I need assistance with a custom HTML/CSS/JavaScript contact form integrated with Formspree. The form successfully sends text fields, but file uploads, specifically images, are not being transmitted or received.

What I'm looking for:
- Analyze my existing code (which I can provide) to identify why image uploads aren't working.
- Correct the code to ensure file uploads function properly with Formspree.
- Confirm whether my current Formspree plan supports file uploads or if an upgrade is necessary.

Key Requirements:
- The form uses fetch and FormData, but attachments are not arriving.
- The form should support JPEG and PNG image formats.
- Provide a quick solution with a clear explanation of the changes made.

Ideal Skills and Experience:
- Proficiency in HTML, CSS, and JavaScript.
- Experience with Formspree integration and troubleshooting.
- Understanding of file upload handling using fetch and FormData.
- Ability to provide clear communication and quick turnaround.

Please note that my budget is $20–40, which can be adjusted for quick delivery.