req.files showing undefined while uploading multiple files via multer - multer

Question

I have initialized disk storage and multer in schema file as static method
const mongoose = require('mongoose');
const multer = require('multer');
const path = require('path');
const POSTS_PATH = path.join('/uploads/posts/photos');
const postSchema = new mongoose.Schema({
content: {
type: String,
required: true
},
user: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
// include the array of ids of all comments in this post schema itself
comments: [
{
type: mongoose.Schema.Types.ObjectId,
ref: 'Comment'
}
],
likes: [
{
type: mongoose.Schema.Types.ObjectId,
ref: 'Like'
}
],
photos:[
{
type: String,
}
]
},{
timestamps: true
});
let storage = multer.diskStorage({
destination: function(req,file,cb){
cb(null,path.join(__dirname, '..', POSTS_PATH));
},
filename: function(req,file,cb){
const filename = file.fieldname+'-'+Date.now();
cb(null,filename);
}
})
postSchema.statics.uploadedPhotos = multer({storage: storage}).array('file',7);
postSchema.statics.postsPath = POSTS_PATH;
const Post = mongoose.model('Post', postSchema);
module.exports = Post;
called this method in my controller file
Post.uploadedPhotos(req, res, function(err){
if (err) {console.log('*****Multer Error:******* ', err)};
console.log(req.files); // shows undefined..
});
This is my html form.
<form action="/posts/create" id="new-post-form" method="POST" enctype="multipart/form-data">
<textarea name="content" cols="30" rows="3" placeholder="Type Here..." required></textarea>
<input type="file" name="file" placeholder="Upload Photos" multiple>
<input type="submit" value="Post">
</form>
problem is when is call console.log for req.files in controller file it shows undefined
could you please rectify my mistake..
I have tried everything but still its shows undefined..