Another ELL post gives a comprehensive explanation about "uses" and "usage".
Besides that, there might be some special cases. Consider the following example
I'm not going to explain all the meanings of "get" today, I'm just going to focus on two uses of "get". But if you want more explanation and other uses, please check your dictionary because there are many ways to use the word "get".
where "uses" seem to mean the way how we use the word "get". With this meaning, are "uses" and "usage" interchangeable?