fix: internal file url

@@ -31,6 +31,9 @@ func ConvertFileUrlToInternal(fileUrl string) string {
 	}
 	var bucketRegion = "https://byte-bank.oss-cn-hangzhou"
 	var bucketInternalRegion = "https://byte-bank.oss-cn-hangzhou-internal"
+	if strings.HasPrefix(fileUrl, bucketInternalRegion) {
+		return fileUrl
+	}
 	if strings.HasPrefix(fileUrl, bucketRegion) {
 		return strings.Replace(fileUrl, bucketRegion, bucketInternalRegion, 1)
 	}