[Help] preview html function not work after a quit command

This plugin works well for normal use. But I have a special situation that the markdown file to preview is created by other command.

So I just don't want to see the temporary markdown file, only want to check the preview created by this plugin.

I want to use a vimL function to do this:

```
function! PreviewJupyterMD()
command that create a md file and load it to a buffer
call mkdp#util#open_preview_page()
exec ":q"
endfunction
```

But if I add `exec ":q"` to this function, seems only load the file but not turn it to html.


After I delete `exec ":q"`, all good.


But I do wanna delete the buffer/window by function.

Thanks in advance!