Testing Experiences Across Multiple Devices

Hello Fellow Showpad Developers,

Does anyone have a successful method for testing custom experiences across multiple devices?  I have looked at BrowserStack and CrossBrowserTesting so far. While I can test how the web app version of an experience will look/behave, I am looking for something where I can see how the Showpad app will wrap/display our experiences. As these experiences are not native apps, we don't have the entire code base to upload and test. I thought I had a solution with CrossBrowserTesting and using their local testing alongside the SDK experience serve hosting, but then ran into CORS issues, and since we don't have control of the headers, I feel like this a not an option. What has worked for you and your teams?

Thank you in advance for sharing your process.