That’s weird. Can’t be sure why that is.
I have a different approach:
1) Create a regular text field. Make note of the ‘key’. You can expose the key by clicking Screen Options at the top right of the Edit Fields screen.
2) Add the code below to a Custom Plugin or functions file.
In the ‘add_filter’ line, of course, use your key from Step 1.
You can also change ‘full’ to some other image size, to get the image filename you are after.
function my_acf_load_value( $value, $post_id, $field ) {
global $my_row_number;
if ( !$my_row_number ) { $my_row_number = 0; }
$meta_key = 'allgemein_mitglied_'.$my_row_number.'_allgemein_profilbild';
$sub_field_value = get_post_meta( $post_id, $meta_key, true );
$image_attributes = wp_get_attachment_image_src( $sub_field_value, 'full' );
$value = basename( $image_attributes[0] );
$my_row_number++;
return $value;
}
add_filter('acf/load_value/key=field_59c9182f21022', 'my_acf_load_value', 10, 3);
