The user who attached the file to the issue.
The charset type of the file. `null` by default. Applicable to text attachments only.
The date and time when the attachment was created. The expected string format is one of those returned by the `getTimestampFormats` function.
The name of the attachment file.
The ID of the attachment.
The MIME type of the file.
The date and time the attachment was last updated. The same as `created` by default. The expected string format is one of those returned by the `getTimestampFormats` function.
The user who last updated the file. The same as `author` by default.
The user groups that can view the attachment. `null` by default.
The users who can view the attachment. If none of the `visibleToUsers` and the `visibleToGroups` parameters are specified, the attachment becomes visible to issue or article readers. `null` by default.