Documentation for JIRA 4.2. Documentation for other versions of JIRA is available too. 
It is possible to attach files during the issue creation screen. Attachment is a field which must be configured to display on the issue creation screen.
1. Under Administration >> Issue Fields >> Field Configuration, ensure that the Attachment field is not hidden.
2. Inspect JIRAs Screen Schemes and see this article on how Screens are associated with Issue Operations. Once you've identified the screen that's used for Issue Creation, ensure that the Attachment field is there.
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