redirect participants to Zoom meeting and back to Qualtrics

Redirecting back to the same survey would be tricky.. and even if you get them back to their survey in progress, I don't believe it will start them on the page where they left off. It would drop them back at the beginning of that survey, not ideal for what you're looking to do. Maybe break up the survey into two surveys (also not ideal, but would make the flow less complex). The last question would have a JavaScript on("click") function that would send them into the Zoom meeting (they would still probably have to click the popup screen about whether to use desktop Zoom or portal Zoom, whether to use their laptop speakers, Bluetooth headset, wired headset, etc.). In the Zoom meeting, you could post an anonymous link in the chat that they would click to open them into the "second half" of your survey. You'd have to marry the data after submission though, which I don't like at all. But the alternative would likely be too brittle a solution to fully trust....