Unable to Import Sample Data, and Loader Continuously Rotating
There are various reasons if you are importing sample-data, and either it is not importing the data correctly, or showing an error when the process is complete, or the loader is continuously rotating without displaying any notice. And, it can be either hosting configuration, WordPress setting or any plugins conflict. And, it can be due to hosting configuration, WordPress settings or any conflict/error in any plugin.
To diagnose the issue, first, check in browser console that whether there is an issue or not. If there is an issue displayed in the browser console, then you can check for that issue from where it originates, which can provide the hint about the issue source.
So, to diagnose the problem, first of all, check the browser console that whether there is an error is shown or not.
If any error displaying in the browser console, then you can check it to identify the source of the error. And, by knowing the error source, you may know which code or plugin is causing the issue.
And, if there is not an error in the browser console, then check the plugin conflict. And, you can check it by disabling all the extra plugins. After disabling all the plugins, you enable each plugin one by one to verify that which plugin is causing the issue.
And, if all these steps don’t help, then any lack or error in the system configuration can be a reason for this issue. So, check that system configuration is up to minimum requirements or not. To know more details about minimum system requirements, refer product documentation.