Issue Summary

Comments with attachments on Confluence pages migrated from Server to Cloud aren't being displayed. Instead of it, we can see a 'Preview unavailable' message.

Notes: This impacts both Cloud-to-Cloud migration & Server-to-Cloud migration

Steps to Reproduce

Cloud to Cloud migration:

1. On the Cloud site, create a space
2. Under the space, create a page and add Attachment A on the page
3. Add comments on the page:
   • Comment 1: insert back Attachment A
   • Comment 2: add a new Attachment B to the comment
4. Export the space with CSV or XML format
5. Import the space to another Cloud site

Server to Cloud migration:

1. On the on-prem site, create a space
2. Under the space, create a page and add Attachment A on the page
3. Add comments on the page:
   • Comment 1: insert back Attachment A
   • Comment 2: add a new Attachment B to the comment
4. Use CCMA to migrate the space to Cloud

Expected Results

The attachments on comments should load normally and be displayed.

Actual Results

Attachment A is working on the comment, but Attachment B isn't working on the comment

With additional testing, we can see this impacts all type of attachments.

• extension tested: .png, .pdf, .csv, .sql, .py

Workaround

The attachment preview is working after viewing it from attachment list.

1. Go to ... > Attachments > Files
2. Click on the problematic attachment to view it
3. Go back to the page and refresh