It is supported in the data center version, but it does not seem to be supported in the cloud version.
Why doesn't the cloud version provide file extension restrictions?
Couldn’t that feature be used in the cloud version as well?
Hi @이찬호 - Welcome to the Atlassian Community!
You will need to open a support ticket with Atlassian to ask them that.
https://support.atlassian.com/contact/#/
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