Hello Kunal,
We are currently tracking this issue as a Bug with the Confluence Cloud Environment. Looking at the bug ticket (https://jira.atlassian.com/browse/CONF-37727), it appears that a fix has been deployed.
If you are still experiencing an issue with previewing attachments in Confluence, please open a support ticket and we will be able to further assist.
-shawn
Thanks for response @Chander Inguva its more like a bug was not sure where I should report
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