You don’t need the bbcode plugin, just use some HTML.
<div align="center">
![Nacho-0|562x499,25%](upload://l0D8BmOF2L3fHHsyw18JmTEnGEm.png)
</div>
Note that the blank line is needed due to the mix of HTML and markdown. Without the blank line you’ll end up with centered text, rather than an image.