Why can't I edit a fillable PDF?

Related questions

1. Can I edit PDF file?
2. How can I edit a PDF on Windows for free?
3. How do I edit a fillable PDF after saving?
4. Can I edit text in a PDF?
5. Can I edit a PDF for free?
6. How do I convert a PDF to a fillable form for free?
7. How can I edit a PDF without Adobe?
8. How do I change the font in a fillable PDF?
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10. Does Google have a PDF editor?

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2. #message
3. #version
4. #forms
5. #check
6. #interactive
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8. #typewriter
9. #currently
10. #field
11. #appears
12. #click
13. #acrobat
14. #create
15. #there
16. #fields
17. #recognition