This provides the ability to add images and detailed descriptions to fields, so content editors have a better sense of what the field will look like on the published page.
This module adds a "Field Thumbnail" fieldset to the config form of every field instance on the site. There is a "Thumbnail" field where you can upload an example of how the field is rendered on the published page, and a "Description" text field where you can add details that supplement the default field description.
If either field is populated, a "Preview Field" link will be appended to the Field Label. This link will trigger a modal that displays the uploaded image, the "Field Thumbnail" description, and the default field description text.
This was created to make field-naming a little less stressful - instead of coming up with a few words that define a complex visual element, the editor can reference an image that shows instead of tells.