Description

Image and File fields always return numeric IDs in the REST API regardless of the return_format field setting (array, url, or id).

Steps to Reproduce

1. Create an Image field with return_format set to "URL" or "Array"
2. Attach an image to a post
3. Fetch the post via REST API
4. Observe that the field returns only the numeric attachment ID

Expected Behavior

The REST API should respect the return_format setting.

Root Cause

In includes/fields/class-acf-field-image.php, the format_value_for_rest() method ignores the field's return_format setting. Same issue in class-acf-field-file.php.

Related

• Reported in the forum: https://wordpress.org/support/topic/image-field-does-not-return-url/