this.$store.dispatch('setFiles', {files: window.images});
// console.log(window.images) shows a proper FileList object

var bodyFormData = new FormData();
Array.from(this.$store.state.files).forEach(file => {
    bodyFormData.append('files[]', file);
    });
axios.post('localhost/api/uploadFile', bodyFormData,
    { headers: { 'Content-Type':'multipart/form-data'}
})
.then(res => console.log(res.data)
.catch(err => console.log(err.response));