Choosing a port over another on a L2 switch

Hi r/Network

We have the following scenario:

https://github.com/alexma2344/sitio/blob/master/assets/images/red.jpg

Where the edge switch parque industrial (L2) at the bottom, has APs connected to it, and then forwards that traffic to "Torre" via "enlace backup" (on its right).

We'd like this traffic to reach "Torre" via the yellow fibre link on the left.

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Am I right to think that, in order for the traffic to be forwarded to the yellow link, the end devices must have the router on top as their gateway. And that STP or the switch itself has nothing to do with how the traffic flow goes.

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PS: I know this could be better formulated but I have limited information about this setup. Just trying to make some sense in general lines.

Both ports are designated - forwarding

Thank you in advance for any inputs.