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Use case

Create an automation rule that will remove the attachments of all issues that were resolved 30 days ago.

Create a new rule and name it appropriately.

Providing a description will help you to identify what the rule does but this step is optional.

Select Scheduled trigger

Schedule the trigger once a day.

Run the automation at 3:00 am as it is preferable to make this operation outside of business hours.

Select JQL selector

Use the following Expression:

status WAS closed BEFORE -30d

Boolean condition

Use the following expression:

%{selector.issue.attachment} != null