diff --git a/config/nacos/cn/firstleg-service.yml b/config/nacos/cn/firstleg-service.yml
index 910720455..36a658d02 100644
--- a/config/nacos/cn/firstleg-service.yml
+++ b/config/nacos/cn/firstleg-service.yml
@@ -4,6 +4,10 @@ spring:
     username: ${FIRSTLEG_DB_USERNAME}
     password: ${FIRSTLEG_DB_PASSWORD}
     driver-class-name: com.mysql.cj.jdbc.Driver
+  servlet:
+    multipart:
+      max-file-size: ${FIRSTLEG_MULTIPART_MAX_FILE_SIZE:50MB}
+      max-request-size: ${FIRSTLEG_MULTIPART_MAX_REQUEST_SIZE:52MB}
 baiyue.clients.warehouse.url: ${WAREHOUSE_SERVICE_URL:}
 baiyue.clients.order.url: ${ORDER_SERVICE_URL:}
 baiyue.clients.file.url: ${FILE_SERVICE_URL:}
diff --git a/config/nacos/local/firstleg-service.yml b/config/nacos/local/firstleg-service.yml
index 1123e5927..b893c82b5 100644
--- a/config/nacos/local/firstleg-service.yml
+++ b/config/nacos/local/firstleg-service.yml
@@ -3,6 +3,8 @@ spring.datasource:
   url: ${FIRSTLEG_DB_URL:jdbc:mysql://127.0.0.1:3306/baiyue_firstleg?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true}
   username: ${FIRSTLEG_DB_USERNAME:root}
   password: ${FIRSTLEG_DB_PASSWORD:123456}
+spring.servlet.multipart.max-file-size: ${FIRSTLEG_MULTIPART_MAX_FILE_SIZE:50MB}
+spring.servlet.multipart.max-request-size: ${FIRSTLEG_MULTIPART_MAX_REQUEST_SIZE:52MB}
 baiyue.clients.warehouse.url: ${WAREHOUSE_SERVICE_URL:}
 baiyue.clients.order.url: ${ORDER_SERVICE_URL:}
 baiyue.clients.file.url: ${FILE_SERVICE_URL:}
diff --git a/firstleg/src/main/resources/application.yml b/firstleg/src/main/resources/application.yml
index 1a5342f3a..e31ea3e38 100644
--- a/firstleg/src/main/resources/application.yml
+++ b/firstleg/src/main/resources/application.yml
@@ -22,8 +22,8 @@ spring:
       config.namespace: ${NACOS_NAMESPACE:public}
   servlet:
     multipart:
-      max-file-size: 5MB
-      max-request-size: 6MB
+      max-file-size: ${FIRSTLEG_MULTIPART_MAX_FILE_SIZE:50MB}
+      max-request-size: ${FIRSTLEG_MULTIPART_MAX_REQUEST_SIZE:52MB}
 baiyue:
   carrier-schedule:
     providers:
diff --git a/firstleg/src/main/resources/openapi/customs-v1.yaml b/firstleg/src/main/resources/openapi/customs-v1.yaml
index 2804db526..b168e1ec2 100644
--- a/firstleg/src/main/resources/openapi/customs-v1.yaml
+++ b/firstleg/src/main/resources/openapi/customs-v1.yaml
@@ -115,7 +115,7 @@ components:
     InboundIds: {name: inboundIds, in: query, required: true, schema: {type: array, minItems: 1, maxItems: 200, items: {$ref: '#/components/schemas/LongId'}}}
   requestBodies:
     ActionBody: {required: true, content: {application/json: {schema: {$ref: '#/components/schemas/ActionRequest'}}}}
-    FileBody: {required: true, content: {multipart/form-data: {schema: {type: object, required: [file], properties: {file: {type: string, format: binary, description: 任意格式且最大50MB}}}}}}
+    FileBody: {required: true, content: {multipart/form-data: {schema: {type: object, required: [file], properties: {file: {type: string, format: binary, description: 任意格式且最大50MB；multipart整请求上限52MB}}}}}}
   responses:
     ContainerResponse: {description: 成功或业务失败, content: {application/json: {schema: {$ref: '#/components/schemas/ContainerEnvelope'}}}}
     DocumentResponse: {description: 成功或业务失败, content: {application/json: {schema: {$ref: '#/components/schemas/DocumentEnvelope'}}}}
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/customs/container/ContainerCustomsMultipartConfigurationContractTest.java b/firstleg/src/test/java/com/baiyue/firstleg/customs/container/ContainerCustomsMultipartConfigurationContractTest.java
new file mode 100644
index 000000000..ccbc57e4b
--- /dev/null
+++ b/firstleg/src/test/java/com/baiyue/firstleg/customs/container/ContainerCustomsMultipartConfigurationContractTest.java
@@ -0,0 +1,35 @@
+package com.baiyue.firstleg.customs.container;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ContainerCustomsMultipartConfigurationContractTest {
+    private static final String FILE_LIMIT = "${FIRSTLEG_MULTIPART_MAX_FILE_SIZE:50MB}";
+    private static final String REQUEST_LIMIT = "${FIRSTLEG_MULTIPART_MAX_REQUEST_SIZE:52MB}";
+
+    @Test void applicationAndEnvironmentConfigsPermitFiftyMegabyteCustomsFiles() throws Exception {
+        assertLimits(read("firstleg/src/main/resources/application.yml"));
+        assertLimits(read("config/nacos/cn/firstleg-service.yml"));
+        assertLimits(read("config/nacos/local/firstleg-service.yml"));
+    }
+
+    @Test void customsOpenApiPublishesFileAndMultipartRequestLimits() throws Exception {
+        assertThat(read("firstleg/src/main/resources/openapi/customs-v1.yaml"))
+            .contains("任意格式且最大50MB", "multipart整请求上限52MB");
+    }
+
+    private static void assertLimits(String yaml) {
+        assertThat(yaml).contains("max-file-size: " + FILE_LIMIT, "max-request-size: " + REQUEST_LIMIT);
+    }
+
+    private static String read(String repositoryPath) throws Exception {
+        Path direct = Path.of(repositoryPath);
+        Path path = Files.exists(direct) ? direct : Path.of("..").resolve(repositoryPath).normalize();
+        return Files.readString(path, StandardCharsets.UTF_8);
+    }
+}