diff --git a/nginx/default.conf.template b/nginx/default.conf.template
index 605ebfd..2c714ab 100644
--- a/nginx/default.conf.template
+++ b/nginx/default.conf.template
@@ -13,7 +13,7 @@ server {
 
     # 前端统一请求 /api，保持原始路径转发给 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;
@@ -24,7 +24,7 @@ server {
 
     # 海外业务使用独立 Gateway；浏览器前缀只在此处改写一次为 /api。
     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.mjs b/src/deployment/nginxConfig.test.mjs
index c8f4703..c32b26a 100644
--- a/src/deployment/nginxConfig.test.mjs
+++ b/src/deployment/nginxConfig.test.mjs
@@ -7,8 +7,10 @@ const testCompose = readFileSync(new URL('../../docker-compose.test.yml', import
 const jenkinsfile = readFileSync(new URL('../../Jenkinsfile', import.meta.url), 'utf8')
 const dockerfile = readFileSync(new URL('../../Dockerfile', import.meta.url), 'utf8')
 
-test('allows qualification uploads with multipart overhead through the API proxy', () => {
-  assert.match(config, /location \/api\/ \{[\s\S]*?client_max_body_size 12m;/)
+test('allows 50 MiB uploads with multipart overhead through both API proxies', () => {
+  assert.match(config, /location \/api\/ \{[\s\S]*?client_max_body_size 55m;/)
+  assert.match(config, /location \/overseas-api\/ \{[\s\S]*?client_max_body_size 55m;/)
+  assert.equal(config.match(/client_max_body_size 55m;/g)?.length, 2)
 })
 
 test('routes domestic and overseas browser APIs to their test gateways without duplicate api prefixes', () => {