Hello, I think there is no need to upload OneSignalSDKWorker because UNA already contains it and it is in plugins_public. What I wrote in the first post is that you cannot have OneSignal 2x. Once in administration in UNA and in Injection.They will fight each other and it will not work. 

Hi @PavelS

The only thing currently configured is "OneSignal: App ID" in Studio-Settings-Push, and it's not working. The pop-up window to allow or disable notifications isn't appearing. My web is https://trabajoar.ar

Check if you have the address correctly..Your Site URL must exactly match your actual domain. For example, https://trabajoar.ar is not the same as https://www.trabajoar.ar.

And then check that the OneSignalSDKWorker.js file is accessible directly from the domain.

https://trabajoar.ar/OneSignalSDKWorker.js