diff --git a/routers/api/v1/repo/file.go b/routers/api/v1/repo/file.go
index 370e4753f3cd8..317213c9466fb 100644
--- a/routers/api/v1/repo/file.go
+++ b/routers/api/v1/repo/file.go
@@ -408,7 +408,7 @@ func canReadFiles(r *context.Repository) bool {
 	return r.Permission.CanRead(unit.TypeCode)
 }
 
-func base64Reader(s string) (io.Reader, error) {
+func base64Reader(s string) (io.ReadSeeker, error) {
 	b, err := base64.StdEncoding.DecodeString(s)
 	if err != nil {
 		return nil, err
diff --git a/services/repository/files/update.go b/services/repository/files/update.go
index f223daf3a9fdf..4f7178184ba47 100644
--- a/services/repository/files/update.go
+++ b/services/repository/files/update.go
@@ -40,7 +40,7 @@ type ChangeRepoFile struct {
 	Operation     string
 	TreePath      string
 	FromTreePath  string
-	ContentReader io.Reader
+	ContentReader io.ReadSeeker
 	SHA           string
 	Options       *RepoFileOptions
 }
@@ -448,6 +448,10 @@ func CreateOrUpdateFile(ctx context.Context, t *TemporaryUploadRepository, file
 			return err
 		}
 		if !exist {
+			_, err := file.ContentReader.Seek(0, io.SeekStart)
+			if err != nil {
+				return err
+			}
 			if err := contentStore.Put(lfsMetaObject.Pointer, file.ContentReader); err != nil {
 				if _, err2 := git_model.RemoveLFSMetaObjectByOid(ctx, repoID, lfsMetaObject.Oid); err2 != nil {
 					return fmt.Errorf("unable to remove failed inserted LFS object %s: %v (Prev Error: %w)", lfsMetaObject.Oid, err2, err)