diff --git a/server/runner/s3presign/runner.go b/server/runner/s3presign/runner.go
index a18ede22a..991d1ab51 100644
--- a/server/runner/s3presign/runner.go
+++ b/server/runner/s3presign/runner.go
@@ -5,6 +5,7 @@ import (
 	"log/slog"
 	"time"
 
+	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"github.com/usememos/memos/internal/storage/s3"
@@ -75,7 +76,8 @@ func (r *Runner) CheckAndPresign(ctx context.Context) {
 		// Process batch of attachments
 		presignCount := 0
 		for _, attachment := range attachments {
-			s3ObjectPayload := attachment.Payload.GetS3Object()
+			payload := cloneAttachmentPayload(attachment.Payload)
+			s3ObjectPayload := payload.GetS3Object()
 			if s3ObjectPayload == nil {
 				continue
 			}
@@ -114,11 +116,7 @@ func (r *Runner) CheckAndPresign(ctx context.Context) {
 			if err := r.Store.UpdateAttachment(ctx, &store.UpdateAttachment{
 				ID:        attachment.ID,
 				Reference: &presignURL,
-				Payload: &storepb.AttachmentPayload{
-					Payload: &storepb.AttachmentPayload_S3Object_{
-						S3Object: s3ObjectPayload,
-					},
-				},
+				Payload:   payload,
 			}); err != nil {
 				slog.Error("Failed to update attachment", "error", err, "attachmentID", attachment.ID)
 				continue
@@ -132,3 +130,14 @@ func (r *Runner) CheckAndPresign(ctx context.Context) {
 		offset += len(attachments)
 	}
 }
+
+func cloneAttachmentPayload(payload *storepb.AttachmentPayload) *storepb.AttachmentPayload {
+	if payload == nil {
+		return nil
+	}
+	cloned, ok := proto.Clone(payload).(*storepb.AttachmentPayload)
+	if !ok {
+		return nil
+	}
+	return cloned
+}
diff --git a/server/runner/s3presign/runner_test.go b/server/runner/s3presign/runner_test.go
new file mode 100644
index 000000000..94a382d6b
--- /dev/null
+++ b/server/runner/s3presign/runner_test.go
@@ -0,0 +1,34 @@
+package s3presign
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"google.golang.org/protobuf/types/known/timestamppb"
+
+	storepb "github.com/usememos/memos/proto/gen/store"
+)
+
+func TestCloneAttachmentPayloadPreservesMotionMedia(t *testing.T) {
+	payload := &storepb.AttachmentPayload{
+		Payload: &storepb.AttachmentPayload_S3Object_{
+			S3Object: &storepb.AttachmentPayload_S3Object{
+				Key: "photos/live.jpg",
+			},
+		},
+		MotionMedia: &storepb.MotionMedia{
+			Family:  storepb.MotionMediaFamily_ANDROID_MOTION_PHOTO,
+			Role:    storepb.MotionMediaRole_CONTAINER,
+			GroupId: "motion-group",
+		},
+	}
+
+	cloned := cloneAttachmentPayload(payload)
+	require.NotNil(t, cloned)
+	require.NotSame(t, payload, cloned)
+	require.Equal(t, payload.MotionMedia, cloned.MotionMedia)
+
+	cloned.GetS3Object().LastPresignedTime = timestamppb.Now()
+	require.Nil(t, payload.GetS3Object().LastPresignedTime)
+	require.Equal(t, "motion-group", cloned.MotionMedia.GroupId)
+}