Cannot create attachement with "Subtask Creation" quickform

Hi,

in Subtask Creation form enhancements a technique to add arbitrary field in the subtask quickform is described. Problem follows:

• On the screen I can add the field for attachments (editing jira-application.properties)
• When I create a new sub-task, i can select a file as attachment, however the attachment is not uploaded and attached to the subtask
• However if I create a new subtask using the issue operation Create sub-task I can add an attachement durig creation of the subtask

Regards,
Edoardo