Trying to login using a url like https://yoursite.com/wp-admin/site2/wp-admin/ I get an Internal Server Error.
There may be something wrong in your site/host already. First please try to fix all of them.
And when I login https://yoursite.com/wp-admin/network/ that gives me the ability to add plugins for the Network, but as I said in my prior post there is no way to access the Settings for your plugin.
As in the previous post, Most of the plgin does not have setting options while managing Network (https://yoursite.com/wp-admin/network/), however the plugin should work in the individual site of the network.
So then I thought why not try to use your plugin anyway. And it worked okay for 2 or 3 tries giving me the default message that comes with the settings dialog. However, as I continued to login and test your plugin eventually I ended up with a 406 error.
We have just tested again in multisite, it is working fine. We will continuously test it and update this plugin ??
So it appears that the plugin cannot be used on a multisite install.
In our site it working fine, anyway we will test it continuously, fix bugs and update with new features too.
Thanks,