Have you tried to click 'Leave'? And what happened?
As you can see, there is no input for " Input URL " as seen in instruction.
Input URL is only needed when using the CLI because the CLI does not know the URL of the site. In Admin, the Url of the site is known and hence an input field is not required...
The above settings are saved and appear when reopen. The process looks like the following:
I open the plugin page - /admin/plugins/blackhole
Any attempt to leave it (even without changes) shows the Grav alert "Changes Detected You have unsaved changes. Are you sure you want to leave without saving?". I don't leave the page
I click the button "Generate"
the browser alert about unsaved changes appears, I click "Close" (an alternative was "Cancel")
As a result the window location becames /admin/plugins/blackhole?blackhole=generate , no more changes, no error messages or warnings
The expected folder zzz is not found. Does the plugin work? Thank you in advance.
@Alexander, I don't think many users on the forum will have experience with the Blackhole plugin. You might consider contacting the author directly by creating an issue on the repo of the plugin.