Error message is as following,
@qianying.dai ,
I think below is the bug which was raised for server version and fixed in the recent versions.
Thanks,
Srinath T
Hi @qianying.dai ,
Welcome to Atlassian community.
We have had some bugs around this , Check the work around and hope that helps. You can also refer the below URL
Hope the above info helps. Have a good day!
welcome to the Atlassian community!
Please take a look to the following troubleshooting article https://confluence.atlassian.com/confkb/unknown-attachment-error-in-confluence-server-and-data-center-7-12-and-earlier-1063179837.html
Hope this helps,
Fabio
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