Prevent user from selecting the image in certain situations

How can we prevent the user from selecting an image in certain situations?

My problem is that I succeed on preventing the upload of the image to the server but the UI is still loaded with the image selected. I don't know how to clear or avoid showing it.

[**See JSFiddle example**](https://jsfiddle.net/oqgzLurv/2/)

The plugin says we should return a Promise when using the function `uploadByFile`. What have I tried:

```
uploadByFile(file)
{
alert('Error, you cannot proceed');

// Does not work
return Promise.reject(new Error(''));

// Does not work
return new Promise((resolve, reject) => {});

// Does not work
return false;
},
```