What you could try is: introduce a condition (validator) to your workflow. When your users try to enter the "closed" status, the validator should check if the issue has at least one Excel attachment, and possibly check its filename, etc.
The Script Runner allows writing custom validators in Groovy, and it really should not take more than 10-15 lines of code: https://jamieechlin.atlassian.net/wiki/display/GRV/Validators
To answer “How scrum works,” most of the teams I've worked with first addressed the question: “where to start?” That question applies to both implementation and improvements on the Scrum framew...
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