ACF image fields

Hi,

I try to insert image in page with ACF.

I create a image fields and upload file in back-end, I don't know why, sometimes it could call the image (only the staff image) and sometimes not.

Now it doesn't get any.

Is it correct for images, as for text fields, to insert where the content goes or the url of the field {acf:field_name}?

I attach two images to help you understand where I would like them.

I await your response.

Iacopo