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For a working example, which you can easily follow, I would recommend reviewing the 'Sample Database Application', which gets installed by default are part of your workspace provisioning. The 'Product Details' page is a form page that include a File Browse item - so if you edit the page, you'll be able to see how this was implemented and mirror this in your own application.
I would also recommend reviewing the APEX User's Guide, specifically:
Chapter 15, Section 15.3 Securing File Uploads
and Chapter 17, section 18.10 About BLOB Support in Forms and Reports