...
Use Acrobat Pro Prepare Form tool. Click on More on the panel at the right and select "Convert to Adobe Sign Form". Then more input field tools including Signature Block will appear in the toolbar near the top.
Adobe Sign Form Field Type Toolbar
...
Date field that needs to be entered should be set to "_es_:role:isdate:format(date, "mm/dd/yy"):tooltip("Format mm/dd/yy")". Specify date formats if space is limited.
All fields except fields reserved for office use in a Webform should be marked signer as participant role. Office use fields should be marked as signer 2.
...
There should be no fields with duplicate names.
For attachment field, drag a text field on the form and use "Rename Field" tag the field name this way: attachmentName_es_:role:attachment