This element adds the attachment field to your screen.
Configuration
Example
Functions
setValue(String ids)
The string should contain a comma-separated list of attachment IDs.
setFieldValue(String action, Map values)
To add multiple attachments, use setFieldValue once for each attachment.
toInteger()
Returns the ID of a field as a number
toString()
Returns a comma-separated list with the IDs of all attachments. 
