Our company recently migrated from Confluence Server/Data Center to Confluence Cloud (Atlassian Cloud).
Previously, we were able to create native Excel external workbook links directly to Excel files stored as Confluence attachments using URLs like: <a href="https://confluence.company.com/download/attachments/12345/Source.xlsx" target="_blank" rel="nofollow noopener noreferrer">https://confluence.company.com/download/attachments/12345/Source.xlsx</a>
The links worked correctly and Excel could update them.
After the migration, the attachment URLs now look like:<a href="https://company.atlassian.net/wiki/download/attachments/12345/Source.xlsx" target="_blank" rel="nofollow noopener noreferrer">https://company.atlassian.net/wiki/download/attachments/12345/Source.xlsx</a>
I can paste this URL into a browser and the Excel file downloads immediately (I'm already logged into Confluence), so the URL itself is valid and accessible.
However, when I create an external workbook reference in Excel such as:='<a href="https://company.atlassian.net/wiki/download/attachments/12345/%5BSource.xlsx%5DSheet1'!A1" target="_blank" rel="nofollow noopener noreferrer">https://company.atlassian.net/wiki/download/attachments/12345/[Source.xlsx]Sheet1'!A1</a>
Excel recognizes it as an external link and attempts to update it, but the update fails and the formula returns #REF!.