Under Administration>Issues select "Issue Type Screen Schemes" and find the scheme associated with the project you are working in then click on configure. Does the Issue type Story have the same Screen Scheme as Epic? If so, then you should be able to just edit the issue type field in the issue (assuming you have permission). If the schemes are different then you can try using move.
In the issue there should be a "More" button. Click on the button and below "Convert to Sub-task" should be an option to "Move". You should be able to move the issue to story and choose what to do with fields that are present/required in one scheme and not the other.
When to use CSV importer When managing your processes in Jira, there are many occasions where you need to create a lot of tasks. Creating them one by one will cost you a lot of time and effort and i...
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