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I'm not sure if I understand correctly the issue you're getting, but when you add an image to your form you should get an wizard like this:
I think you are trying to add the image field from the Basic Fields:
Please share us a screenshot when you're adding the field to your form, this guide will help you to upload an image with your post:
The screenshot should be of the web console, these keyboard shortcuts will help you to get the console on Chrome:
Mac: Cmd + Opt + J
Windows: Ctrl + Shift + J
We look forward to your response.