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Attachments may filtered out by regular expressions (see java regex documentation and a test page) matching the name of the files. Add name exclusiön exclusion patterns in the Attachment Filtering page. Attachments whose name matches either of the expressions added, will not be attached to the issues.
To make your regex case-insensitive you have to use (?i) before your filter.
Regex | matches | not match with |
---|---|---|
(?i).*\.mp3$ | something.mp3 something.Mp3 something.MP3 | something.MP4 something.mp34 somethingMP3.jpg |