UPDATE ......Confluence has now been updated to version 9.2.6. Please see following page for details and feedback about changes:
Updates
viewfile: com.atlassian.confluence.macro.MacroExecutionException: com.atlassian.confluence.macro.MacroExecutionException: The viewfile macro is unable to locate the attachment "SIG-NGN 12 - sig-ngn-measurement - Jeronimo Bezerra.pdf" on the page "12th SIG-NGN Meeting" in space "SIGNGN"