Ivan

I would also like to be able to choose a regular simple extension .webp

Thank you very much for your help.
I tried the PODS plugin for CPT and created a simple Gutenberg gallery, but even in this case it didn’t work. So it means that you are probably right and the problem will be hidden somewhere else. I just don’t know where …
In my opinion, my theme is not complicated at all. In functions.php I have only a few basic things:

<?php

function thalia_files()
{
    wp_enqueue_style('main_styles', get_theme_file_uri('/build/style-index.css'), NULL, time(), 'all');  // , NULL, time(), 'all' - jen pro Development
    wp_enqueue_style('custom-google-style', 'https://fonts.googleapis.com/css2?family=Mulish:wght@200;300;400;500;600;700;800;900&display=swap');
    wp_enqueue_script('main_js', get_theme_file_uri('/build/index.js'), NULL, microtime(), true);
    wp_localize_script('main_js', 'thaliaData', array(
        'site_url' => esc_url(site_url()),
        'nonce' => wp_create_nonce('wp_rest')
    ));
}

add_action('wp_enqueue_scripts', 'thalia_files');

function thalia_features()
{
    add_theme_support('title-tag'); 
    add_theme_support('post-thumbnails');
    add_image_size('hero-post', 1920, 550); 
    add_post_type_support('page', 'excerpt');
    add_image_size('nahledy', 400, 300, true);
}

add_action('after_setup_theme', 'thalia_features');

And in Photoswipe settings is my CPT in “Available post types on this site:”

Now I remember having a similar problem on another website where I had CPT and Photoswipe Lightbox. It all worked well, but about a year ago it stopped working, I still don’t know why …
I would like to solve this problem because this is my favorite Lightbox for WordPress.

I will try to contact you via email.

• This reply was modified 3 years, 3 months ago by Ivan.

Thank you for your answer.
I noticed one more thing. Lightbox does not work on Custom Post Types. In this case, it is called a “produkt”.

function produkt_post_types()
{
    register_post_type('produkt', array(
    	'show_in_rest' => true,
        'public' => true,
        'supports' => array('title', 'editor', 'thumbnail'),
        'rewrite' => array('slug' => 'produkty'),
        'has_archive' => true,
        'public' => true,
        'labels' => array(
            'name' => 'Produkty',
            'add_new_item' => 'Add New Produkt',
            'edit_item' => 'Edit Produkt',
            'all_items' => 'V?echny Produkty',
            'singular_name' => 'Produkt'
        ),
        'menu_icon' => 'dashicons-pressthis',
    ));
}
add_action('init', 'produkt_post_types');

• This reply was modified 3 years, 3 months ago by Ivan.

I did a terrible hack, but it works.

add_filter('the_content','new_content');
function new_content($content) {
    $content = str_replace('<figure><a','<figure><a data-lbwps-width="1000" data-lbwps-height="800" data-lbwps-handler="0" ', $content);
    return $content;
}

Thanks again!

Thank you very much ??.
I did a quick test and the lightbox works.
Now I need to implement attributes properly. Either via Javascript setAttribute or extend the existing Gutenberg Gallery block. I don’t know yet…
That will be my next challenge ??

Enable “Sort Gallery” button again in Gallery -> Options -> Gallery page -> Sort options clicking on “Custom order”