Sending emails as daily reminder notifications

Hi

you can achieve this in multiple ways.

• In your user input task configuration (righ clik then properties) you have an option called Escalation. Using this Escalation view you can configure send email notification event every day until the task is completed. 
• To see how to configure this Escalation see https://docs.appian.com/suite/help/22.1/Process_Node_and_Smart_Service_Properties.html#escalation-timer-levels

• Another option before your user input task add AND condition and split the workflow into two paths (one for User Input task, another for email notification)
  • Add a timer condition before  email notification to send email notification every day until user completes the task using loop
  • Note: if you are using this option Make sure your user input task workflow end node configure as terminate node.

I would suggest to use first option.