expire time settings

[DeepVasoya08]

is there any way to set expire time for any file like images? here is code i'm using but it is not working

`
conn.once("open", () => {
gfs = new mongoose.mongo.GridFSBucket(conn.db, {
bucketName: "stories",
});
});

const storage = new GridFsStorage({
url: process.env.MONGO_URL,
file: (req, file) => {
return new Promise((resolve, reject) => {
console.log(file);
const filename = file.originalname;
const fileInfo = {
filename: filename,
bucketName: "stories",
createdAt: { type: Date, expires: 20, default: Date.now },
};
resolve(fileInfo);
reject("server error!!");
});
},
options:
});

const upload = multer({ storage });`