diff --git a/pkg/proto/third/third.pb.go b/pkg/proto/third/third.pb.go
index ed8f349aa..ef43ee411 100644
--- a/pkg/proto/third/third.pb.go
+++ b/pkg/proto/third/third.pb.go
@@ -415,10 +415,11 @@ type InitiateMultipartUploadReq struct {
 
 	Hash        string `protobuf:"bytes,1,opt,name=hash,proto3" json:"hash"`
 	Size        int64  `protobuf:"varint,2,opt,name=size,proto3" json:"size"`
-	MaxParts    int32  `protobuf:"varint,3,opt,name=maxParts,proto3" json:"maxParts"`
-	Cause       string `protobuf:"bytes,4,opt,name=cause,proto3" json:"cause"`
-	Name        string `protobuf:"bytes,5,opt,name=name,proto3" json:"name"`
-	ContentType string `protobuf:"bytes,6,opt,name=contentType,proto3" json:"contentType"`
+	PartSize    int64  `protobuf:"varint,3,opt,name=partSize,proto3" json:"partSize"`
+	MaxParts    int32  `protobuf:"varint,4,opt,name=maxParts,proto3" json:"maxParts"`
+	Cause       string `protobuf:"bytes,5,opt,name=cause,proto3" json:"cause"`
+	Name        string `protobuf:"bytes,6,opt,name=name,proto3" json:"name"`
+	ContentType string `protobuf:"bytes,7,opt,name=contentType,proto3" json:"contentType"`
 }
 
 func (x *InitiateMultipartUploadReq) Reset() {
@@ -467,6 +468,13 @@ func (x *InitiateMultipartUploadReq) GetSize() int64 {
 	return 0
 }
 
+func (x *InitiateMultipartUploadReq) GetPartSize() int64 {
+	if x != nil {
+		return x.PartSize
+	}
+	return 0
+}
+
 func (x *InitiateMultipartUploadReq) GetMaxParts() int32 {
 	if x != nil {
 		return x.MaxParts
@@ -1238,149 +1246,151 @@ var file_third_third_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/pkg/proto/third/third.proto b/pkg/proto/third/third.proto
index 1c99c6728..b5264b3d3 100644
--- a/pkg/proto/third/third.proto
+++ b/pkg/proto/third/third.proto
@@ -40,10 +40,11 @@ message PartSizeResp {
 message InitiateMultipartUploadReq {
   string hash = 1;
   int64 size = 2;
-  int32 maxParts = 3;
-  string cause = 4;
-  string name = 5;
-  string contentType = 6;
+  int64 partSize = 3;
+  int32 maxParts = 4;
+  string cause = 5;
+  string name = 6;
+  string contentType = 7;
 }
 
 message UploadInfo {