Is it possible to set attachments mandatory at the Service Checkout Panel? Hopefully a condition that lets you specifiy only when a certain item is selected?
I am not aware that there's such an option. As a workaround, we added to user options a mandatory checkbox, which only purpose was to kindly remind the customer that the request without an attachment will be turned down without a further notice.
Kind of "i agree with the terms" type of solution. Not a technical one, but better than nothing.