COYO does not provide any emojis itself. They are loaded from your operating system so as not to put any additional strain on software performance. If your emojis are not displayed, this is not due to COYO.
It’s possible to install and display emojis locally. For instance, Chrome offers users the "Chromoji" add-on. This add-on helps to display emojis in a more uniform way. Other similar add-ons also exist, such as for Firefox.
Note regarding add-ons:
We cannot provide any guarantee for browser add-ons/plugins, as their functioning and interaction with COYO is outside of our area of influence. We ask that you take this into consideration when installing add-ons.