We work on JIRA Software v7.5.0.
We see a problem adding attachments with the '[' or ']' sign in a description or comment.
The attachment is added to the ticket but in the corresponding description or comment, the attachment is not visible.
Instead, we get a link starting with '^', and the attachment does not appear.
example: [^ meeting rooms [FR] .msg]
I have looked at the list of special characters that are not supported by attachments and that character is not used.
I do not find the same problem in the frequently asked questions or even ticket related to this problem.