fix file convert to base64

server/routers/dry-wash/order.js

@@ -387,7 +387,7 @@ const analyzeImage = async (fileId, token) => {
 
 const convertFileToBase64 = (file) => {
     const base64Image = file.buffer.toString('base64')
-    return base64Image
+    return `data:${file.mimetype};base64,${base64Image}`
 }
 
 process.env["NODE_TLS_REJECT_UNAUTHORIZED"] = "0"