diff --git a/nginx/default.conf.template b/nginx/default.conf.template
index 69457a86..3688b5f7 100644
--- a/nginx/default.conf.template
+++ b/nginx/default.conf.template
@@ -21,7 +21,7 @@ server {
 
     # 前端代码中的 API 前缀为 /api；保持原始路径转给 Gateway。
     location /api/ {
-        client_max_body_size 12m;
+        client_max_body_size 55m;
         proxy_pass ${API_UPSTREAM};
         proxy_http_version 1.1;
         proxy_set_header Host $proxy_host;
@@ -32,7 +32,7 @@ server {
 
     # 海外业务使用独立 Gateway；将浏览器前缀改写为 Gateway 的 /api 前缀。
     location /overseas-api/ {
-        client_max_body_size 12m;
+        client_max_body_size 55m;
         rewrite ^/overseas-api/(.*)$ /api/$1 break;
         proxy_pass ${OVERSEAS_API_UPSTREAM};
         proxy_http_version 1.1;
diff --git a/src/deployment/nginxConfig.test.ts b/src/deployment/nginxConfig.test.ts
index a687f321..2fb21fba 100644
--- a/src/deployment/nginxConfig.test.ts
+++ b/src/deployment/nginxConfig.test.ts
@@ -9,8 +9,10 @@ const jenkinsfile = readFileSync(resolve(process.cwd(), 'Jenkinsfile'), 'utf8')
 const dockerfile = readFileSync(resolve(process.cwd(), 'Dockerfile'), 'utf8')
 
 describe('admin nginx deployment config', () => {
-  it('allows qualification uploads with multipart overhead through the API proxy', () => {
-    expect(config).toContain('client_max_body_size 12m;')
+  it('allows 50 MiB files plus multipart overhead through both bounded API proxies', () => {
+    expect(config.match(/client_max_body_size 55m;/g)).toHaveLength(2)
+    expect(config).not.toContain('client_max_body_size 12m;')
+    expect(config).not.toContain('client_max_body_size 0;')
   })
 
   it('prevents the application shell from retaining stale chunk references', () => {