add_filter( 'frm_filtered_lookup_options', 'change_lookup_options', 10, 2 ); function change_lookup_options( $options, $args ) { if ( $args['field']->id === '25' ) { // change 25 to the id of the field in the other form foreach ( $options as $k => $option ) { $options[ $k ] = wp_get_attachment_url( $option ); } } return $options; }
Using Walters example to get the image URL you could set an change event via JS to throw that image URL into an HTML field and/or with some custom HTML.
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Since form fields have been recently expanded to support a wide range of shortcodes, maybe a view with a filter for the current record and the standard show image would work?