Laravel: Having trouble handling multiple files for upload

I have an image uploader that allows multiple images on the frontend (vue.js). When I send it over to Laravel, it's not hitting my foreach loop. I traced the print logs to be executing up until the foreach loops runs but I'm not sure why it's not going through each one unless that's not the correct way.

** JS **

let formData = new FormData();
this.files.forEach((x,index) => {
    formData.append("file", x)
});

axios.post('/admin/upload', formData, {
    headers: {
        'Content-Type': 'multipart/form-data',
    }
})

**Laravel **

print "outside";
if ($request->hasFile('file')) {
    print "inside";
    $files = $request->file('file');
    $stack = [];
    foreach ($files as $file) {
        print "Looping";
        $fileName = Storage::put('/trace/', file_get_contents($file->getRealPath()), ['visibility' => 'public']);
        array_push($stack, $fileName);
    }
    return response()->json($stack);
}

via Chebli Mohamed