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By default, all files uploaded to ObjSpace are private but one of the major benefits of the platform is the static file serving capabilities. To publicly access files you'll need to update the ACL (Access control lists) for files and/or buckets to allow for public access.
Each program does this differently - in FTP-style programs this is usually under the 'permissions' section and you need to change the 'Readable by:' option to 'World'.