How do I get my data connection to take priority over wifi?

[Don Smirl]

We have installed the BARCO clickshare units on TVs in my office and there is an accompanying app through Google Play which allows you to project from your phone on the TV. This is done through a wifi connection. Since you have only have 1 wifi connection active on the phone at one time it limits how the capabilities. Is there a way to get applications such at YouTube to use mobile data instead of using wifi? I know this is usually asked for the reverse but in this case it makes sense. I have a Samsung S7 but I don't think it matters in this case.