Support Attachment type *.uns

I am syncing between Octane and Azure DevOps.

In Octane I have added uns to ATTACHMENTS_FILE_EXTENSION_WHITE_LIST and I can successfully attach a file in Octane with file type of uns.  

However the connector is saying File extension is not supported as shown below.

Is there a reason Connect does not just support any attachment file types since both sync systems typically enforce attachment types?

Error in Connect logs...

com.connect.api.exceptions.BCException: com.hpe.adm.nga.sdk.exception.OctaneException: {"http_status_code":403,"correlation_id":"7gy3m3qqy61e7s1g6derl2r1j","description":"Storage action upon entity type [attachment] has failed, error: File extension is not supported: 'uns'","error_code":"platform.file_extension_error","description_translated":"Storage action upon entity type [com.hp.mqm.bl.platform.exception.MimeTypeValidationException: File extension is not supported: 'uns'] has failed, error: [Ljava.lang.Object;@66ca64af","properties":{"message":"service=[CreateServiceImpl], blFlowCommand=[CreateBinaryCommand], token=[AttachmentEntityToken] has thrown an exception and terminated BL flow. See service result log message for details. Error=[Storage action upon entity type [attachment] has failed, error: File extension is not supported: 'uns']"},"business_error":"true"}
at com.connect.octane.OctaneSyncItem.update(OctaneSyncItem.java:1488)
at com.connect.server.sync.wrappers.WrappedSyncItem.update(Wrapped...