How to resend custom flow OTP on user request

Hello, I am pretty new to AWS and am using Amplify to work on my first app. I set up auth using a custom flow based on the code here (https://github.com/mobilequickie/amplify-passwordless-sms-auth), but now I am stuck on how I should go about resending the OTP if the user requests it. I was considering saving the OTP in Dynamo, but I am wondering if there is a way to simply restart the auth flow process so they receive another code. Or maybe there is an even better way that I'm just not aware of? Thank you!