+ let extension: string
+ const fileExtension = getLowercaseExtension(file.originalname)
+ const extensionFromMimetype = getExtFromMimetype(mimeTypes, file.mimetype)
+
+ // Take the file extension if we don't understand the mime type
+ if (!extensionFromMimetype) {
+ extension = fileExtension
+ } else {
+ // Take the first available extension for this mimetype
+ extension = extensionFromMimetype
+ }
+