diff --git a/sdk/pom.xml b/sdk/pom.xml
index 5d77e451..b2ec3a2e 100644
--- a/sdk/pom.xml
+++ b/sdk/pom.xml
@@ -68,6 +68,12 @@
             <version>4.5.13</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpmime</artifactId>
+            <version>4.5.13</version>
+        </dependency>
+
         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>
diff --git a/sdk/src/main/java/cn/wildfirechat/sdk/GeneralAdmin.java b/sdk/src/main/java/cn/wildfirechat/sdk/GeneralAdmin.java
index 594a9ad3..d41dbb12 100644
--- a/sdk/src/main/java/cn/wildfirechat/sdk/GeneralAdmin.java
+++ b/sdk/src/main/java/cn/wildfirechat/sdk/GeneralAdmin.java
@@ -274,7 +274,7 @@ public class GeneralAdmin {
         return AdminHttpUtils.httpJsonPost(APIPath.GET_CUSTOMER, null, String.class);
     }
 
-    private static IMResult<OutputPresignedUploadUrl> getPresignedUploadUrl(String fileName, int/*ProtoConstants.MessageMediaType*/ mediaType, String contentType) throws Exception {
+    public static IMResult<OutputPresignedUploadUrl> getPresignedUploadUrl(String fileName, int/*ProtoConstants.MessageMediaType*/ mediaType, String contentType) throws Exception {
         String path = APIPath.Get_Presigned_Upload_Url;
 
         InputGetPresignedUploadUrl requestPojo = new InputGetPresignedUploadUrl();
diff --git a/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java b/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java
index d12401bd..4c35c36d 100644
--- a/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java
+++ b/sdk/src/main/java/cn/wildfirechat/sdk/RobotService.java
@@ -493,7 +493,7 @@ public class RobotService implements Closeable {
         return robotHttpUtils.httpJsonPost(path, requestPojo, Void.class);
     }
 
-    private IMResult<OutputPresignedUploadUrl> getPresignedUploadUrl(String fileName, int/*ProtoConstants.MessageMediaType*/ mediaType, String contentType) throws Exception {
+    public IMResult<OutputPresignedUploadUrl> getPresignedUploadUrl(String fileName, int/*ProtoConstants.MessageMediaType*/ mediaType, String contentType) throws Exception {
         String path = APIPath.Robot_Get_Presigned_Upload_Url;
 
         InputGetPresignedUploadUrl requestPojo = new InputGetPresignedUploadUrl();