Connection lost error, 503 error while uploading images in product gallery or plugin conflict issue

Connection lost. Saving has been disabled until you’re reconnected. We’re backing up this post in your browser, just in case. is getting error while uploading an image to product gallery or clicking on link “set product image”. Images upload issue in product gallery. while selecting images and uploading images in product gallery the same issue coming. Elementor plugin conflict issue with EKOMMART theme. The plugin variation swaches for woocommerce. Can anybody has alternative of this plugin?