devlink1337

If you’re still interested in a solution than i might got something.

in functions.php register jquery file

add_action('wp_enqueue_scripts','jquery');
function jquery() {
  wp_register_script('jquery', 'https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js', true);
  wp_enqueue_script('jquery');
}

next go to plugin folder and in the before-after-image-slider.php

delete the following content:

line 24 – 31

  ?>
  <script type="text/javascript">
  jQuery(document).ready(function($){
  $('.ba-slider').beforeAfter();
  });
  </script>

  <?php

and at last in folder js modify the before-after.min.js

Copy the code from the JS part from the codepen demo:

https://codepen.io/bamf/pen/jEpxOX

tried it and worked. can now slide through multiple images and the slider recognizes each seperately

I see you really have updated the code but just for your information, you updated the wrong line of code.

Line 1606 and 1607

      if(mkdir($new_folder_path)) {
		  @chmod($new_folder_path, 0755);
[...]

realised it after updating the plugin.

I discovered that there might be an issue with our configuration. I successfully tested it on a local nginx installation, installed the plugin there and it worked fine.
The changes are a good workaround just as I said everything else worked as expected on the server. I would definately recommend the changes made, in case some other stupids do the same mistakes as we did ??