diff --git a/web-api/ruoyi-common/src/main/java/com/ruoyi/common/utils/TencentCosUtil.java b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/utils/TencentCosUtil.java
index 8dfad2e..1612c9e 100644
--- a/web-api/ruoyi-common/src/main/java/com/ruoyi/common/utils/TencentCosUtil.java
+++ b/web-api/ruoyi-common/src/main/java/com/ruoyi/common/utils/TencentCosUtil.java
@@ -67,6 +67,14 @@ public class TencentCosUtil {
         try {
             InputStream inputStream = file.getInputStream();
             ObjectMetadata objectMetadata = new ObjectMetadata();
+            // 必须设置长度，否则底层 OkHttp 会告警「No content length specified…」并整段缓冲到内存，易 OOM
+            long contentLength = file.getSize();
+            if (contentLength >= 0) {
+                objectMetadata.setContentLength(contentLength);
+            }
+            if (file.getContentType() != null && !file.getContentType().isEmpty()) {
+                objectMetadata.setContentType(file.getContentType());
+            }
             PutObjectRequest putObjectRequest = new PutObjectRequest(
                     bucketName,
                     key,