hi!, i need to use slingshot (whit autoform https://atmospherejs.com/timbrandin/autoform-slingshot) , i have this package well configurated to upload files, but i need to crop first whit visual canvas, i think to use jquery cropper but i try to use onBeforeUpload, and i can to see the cropper, but i can upload the crop image.
any clue to do that?