Question

I know that forms in .pdf made by Adobe Acrobat can act like questionnaire or application blank for filling input fileds and saving results, but is it possible in a way to add more interactiviry to them
– add file upload or attachment to resulting document?

Answer 1

It’s kind of possible.

You’ll need to add Javascript code to your documents. The code should show Browse For File dialog and import selected file to the document. Please have a look at Import Named File Attachment script (at the bottom of the page). I doubt that this solution will work in Adobe Reader or alternative PDF viewers, but Acrobat Professional should do the trick.

Another solution is given is this thread on Adobe forums:

…I figured out a roundabout way to attach files in adobe reader (not
the full blow adobe acrobat reader). Via Adobe Acrobat 9 Pro I
created a blank form with the “comment/mark up” tools enabled. Then I
merged that file with the other PDF form that was formatted with
fields, radial buttons etc. I had to create the blank form for the
attachments separately because if I tried to enable the “comment/mark
up’ tool on the form with fields and radial buttons it disabled the
fields. … The comment markup tool then allowed me to attach files
via the “attach file as a comment” option.