Hi @anielsen
The image field will always save it’s data as the attachment ID, then when using the get_field function, the value will be modified based on the return value setting.
This explains why your slider plugin is not able to read in the image.
Perhaps you can ask the developer of the slider plugin how you can make this compatible with ACF when ACF save’s it’s image custom field data as the attachment ID, not the attachment URL.
Thanks
E
