Yahthat’s possible
—we can use get active window activity once after using the open browser activity which will help us process any activity in the browser page which is already opened via open browser
OR
—we can pass the output variable from open browser activity which is of type UiBrowser which can be passed to the attach browser activity as input to the property browser property in the property panel of attach browser activity
Or
Simple isn’t it
Hope this would help you resolve this
Here you go with screenshots @CamiCat
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In open browser with browser output variable
And press ctrl + k and set a name for that variable of type Uipath.Core.Browser

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Then with that variable passed to the attach browser activity to the browser input property with the variable that we obtain from open browser activity
Cheers @CamiCat