USM introduced optional streaming support for synchronization of large attachments via OLOX2. Temporary data uploaded by OLOX2 clients for future sync-requests is stored using the OX ManagedFileManagement service. Since the upload of multiple large files may exceed the default settings for temporary files of that service, USM defines a new property in which the timeout for files stored by
USM can be configured:

* com.openexchange.usm.temp_files.timeout (default:7200000) specifies
timeout in milliseconds after which a temporary file is removed if it's
not accessed