Hi @rxunique
ngrok is the most straightforward.
Once installed, you just need to run in a shell the command ngrok http 60024 (port has to match with your local server) and it'll provide you a remote URL (i.e. https://a7f7-151-60-70-63.ngrok-free.app) then, replace localhost:60024 with the remote one provided in your Retool app. That's it.
Hope this help