Add a upload field type for contact form builder (proposal)

[andronic90]

One of our customer is interested to have a additional type in contact form builder : upload type (like in cf7). I think this is a good idea to make this option directly in unyson.

[Ataurr]

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Our buyers also want this

Any way to add attachment field to contact form?
I do not see any attachment field options in form builder.

[trasek]

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