How to add the background image to the form

I've found out, that if i upload my background image, not paste it by link, background don't work. My image too big? 

You can use the Form Designer ot add a background image to your form.

You can either use your hosted image link or upload first the image to your Form Builder.

Either option should work. Are you not able to upload the file? Can you please retry also.

Let us know if issue is not resolve.