Link fixing doesn't fix links containing Jira attachments in Jira

When migration is done to Jira Cloud, link fixing is needed as per https://confluence.atlassian.com/confkb/after-a-successful-server-to-cloud-migration-url-links-are-broken-in-the-new-cloud-instance-1077781093.html to fix various links. 

Though this method doesn't fix the Jira attachment URLs like <jira-server-url>/secure/attachment/ in Jira.

For example, in a Jira issue description/comment, there will be a link in format:

https://jira.company.com/secure/attachment/92392
https://serverurl/secure/attachment/1111/name

Please provide a method to fix links of this format too post-migration. There should be an ability to properly fix such URLs in description, custom fields and comments.