How do I enter a search term to identify a JIRA issue where the attached files may include a stub of a filename?
This isn't default functionality. This can only be accomplished through an add on.
Here are some options:
https://marketplace.atlassian.com/apps/1211135/search-attachments?hosting=server&tab=overview
https://marketplace.atlassian.com/apps/1216594/attachment-search-for-jira?hosting=server&tab=overview
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