diff --git a/service/resource.proto b/service/resource.proto
index 6320d5d..afd1974 100644
--- a/service/resource.proto
+++ b/service/resource.proto
@@ -173,6 +173,7 @@ message UploadFileBackendFragmentReq {
     string resource_id = 16; // 资源ID
     string backup_type = 17; // 资源备份：oss
     bytes metadata = 18; // json格式
+    int64 content_length = 19; // json格式
 
     int64 cache_type = 100; // 缓存类型：0=不缓存 1=存储数据库
     int64 user_id = 101;