React & material-ui upload field

uploadbutton.js

<Button
    raised
    component="label"
    color="primary"
    disabled={this.state.loading}
>
    {'Upload'}
    <FileUpload className={classes.rightIcon}/>
    <input
        onChange={e => console.log(e.target.files[0])}
        style={{display: 'none'}}
        type="file"
    />
</Button>