Comment attachment does not show the name of the file when opening

Issue Summary

For migrated instances when trying to view the attachment for comment does not show the name of the file instead it shows as "UNKNOWN"

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Migrate from server
2. Try to view thumbnail of attachment in a comment

Expected Results

The attachment should open and show the name of the file when viewing the attachment

Actual Results

After the fix from https://jira.atlassian.com/browse/CONFCLOUD-76315 the attachment opens up but the file name is showing as 'unknown'

Workaround

It's been fixed on the CCMA side, so NEW migrations will now send the name to Media, which wasn't previously required, but a fix will be needed for existing customers who have migrated.