Hello @namnh73
Unfortunately, we are not able to recreate this issue in our testing environment. We disabled all third-party plugins and set the default WordPress theme (Twenty Twenty-One). Then we created a test listing and uploaded images from the front end (Screenshot 1). When we open the listing page images loaded properly (Screenshot 2).
Please, recheck this issue, by disabling third party plugins. If it does not help, you can create a staging website with the default theme of WordPress (for example, Twenty Twenty-One). Then you can install only the uListing plugin and check for this issue again.
This will help you make sure the plugin does not conflict with other themes or plugins.
Make sure that, your system settings match to plugin’s system requirements.
Best wishes
