Install and activate Toolset Types.
Go to Toolset Dashboard and click "Add custom fields" for Pages post type and add a new field group of the type "Image" called say, "Page Gallery".
Since we want to be able to select/upload multiple images, select "Allow multiple instances of this field" for "Single or repeating field?".
Save the field group.
Edit your Page(s) and populate the field by adding/selecting the images.
Register a custom size for the images in the gallery.
Install and activate Code Snippets plugin.
Go to Snippets > Add New.
Title: Custom image sizes
add_image_size( 'gallery_image', 600, 338, true ); // 16 x 9
Set the snippet to run everywhere. Save changes and activate.
If you are going to use images that are already present in the Media Gallery, regenerate thumbnails.
Let us specify that the HTML output of WordPress galleries and other elements be in HTML5.
Add another code snippet.
Title: Add support for HTML5 markup
add_theme_support( 'html5', array( 'comment-list', 'comment-form', 'search-form', 'gallery', 'caption' ) );
Create a custom shortcode that returns comma-separated IDs of the images.
Add another Code Snippet.
Title: [Toolset] Multiple instance image field
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