Hi,

You are able to upload images to Files on the console. Now you want to access your uploaded files through Business Logic i.e. collection hooks, check this link. Files aren't stored directly with Kinvey (they're on Google Cloud Storage). That's why accessing them is a little different compared to the data in collections.

Please take a look at following code snippet. I have tested this in my environment and it worked fine:

var context = modules.backendContext;
  var utils = modules.utils;
  var appKey = context.getAppKey();
  var masterSecret = context.getMasterSecret();
  var uri = 'https://' + request.headers.host + '/blob/'+ appKey + '/' + '<"_id" of your file>'; // id variable
  var authString = "Basic " + utils.base64.encode(appKey + ":" + masterSecret);
  var requestOptions = {
    uri:uri, 
    headers: {
      "Authorization":authString
    }
  };
  var auth = modules.request.get(requestOptions,function(error, res, body){
    if (error){
      response.error(error);
    } else {
      response.body = JSON.parse(body);
      response.complete(res.status);
    }
  });

Thanks,

Pranav