Summary

When warning users about restricted characters in an attachment filename, JIRA refers to characters that aren't actually in the name.

Steps to Reproduce

(example)

1. Create an issue.
2. Attempt to attach a file with name "test/test.txt"

Expected Results

An error message warning about / being a restricted character is displayed.

Actual Results

In the error message, the restricted character is replaced with a colon:

Workaround

Regardless of the content of the error message, remove all restricted characters (as listed in the documentation - Attaching a File): '\', '/','\"', '%', ':', '$', '?', '*' from the filename.