How can I get other form keys in req.body before multer processing file?

First, I want use multer in a single router, and this request‘s data not only a file, but also include other form data,
these are part of important code
```
const bodyParser = require("body-parser");
const staticPath = path.join(__dirname, "..", "static");
const urlencodedParser = bodyParser.urlencoded({ extended: false }); // create application/json parser

const multerStorage = multer.diskStorage({
destination: function (req, file, cb) {
try {
if (!fs.existsSync(path.join(staticPath, "cache"))) {
fs.mkdirSync(path.join(staticPath, "cache"));
}
cb(null, path.join(staticPath, "cache"));
} catch (error) {
console.log("destination = error ======>", error);
}
},
filename: async (req, file, cb) => {
try {
console.log('req.body =============>', req.body.fileMD5)
console.log("file ====> ", file);
const { fieldname, originalname, mimetype } = file;
let fileFormat = originalname.split(".");
const uniqueSuffix = Date.now() + "-" + Math.round(Math.random() * 1e9);
cb(
null,
`${fieldname}-${uniqueSuffix}.${fileFormat[fileFormat.length - 1]}`
);
} catch (error) {
console.log("filename = error ======>", error);
}
},
});
const uploadCache = multer({ storage: multerStorage });

router.post("/sliceFile", urlencodedParser, uploadCache.single("file"), (req, res) => {
console.log('urlencodedParser =====> ',req.body);
try {
res.send({
code: 200,
message: "test",
});
} catch (error) {
console.log(error);
}
});

module.exports = router;
```
before uploadCache.single("file")， I want use urlencodedParser to processing form‘s fileMD5, used as a filename to save a file , but I can't get any in rer.body during multerStorage, can you tell me how to use form other data during multerStorage handle file