Resolve "Make it possible to use the file field in the form view"

Merge Request Checklist

• changelog.md has been updated if required
• New/updated Premium features are separated correctly in the premium folder
• The latest Chrome and Firefox have been used to test any new frontend features
• Documentation has been updated
• Quality Standards are met
• Performance: tables are still fast with 100k+ rows, 100+ field tables
• The redoc API pages have been updated for any REST API changes
• Our custom API docs are updated for changes to endpoints accessed via api tokens
• The UI/UX has been updated following UI Style Guide

TODO

• Enable file fields for form view
• Implement endpoint for anonymous file uploads
• Hit new endpoint if in form view
• Disable URL uploads

Closes #525 (closed)