Some companies using improveit 360 have elected to have the Prospect Comments field feed directly into the Appointment Comments field. This automation is usually accomplished via a Workflow Rule. Workflow Rules, Processes and feature automations can be setup by improveit 360's Configuration team, as an Advanced Service (starting at $250 minimum).
Note: some businesses use these two Comments fields independently:
Workflow Rules support up to 255 characters. If the value in the Prospect Comments field is greater than 255 characters, the system will throw a flow error.
To the end user, the system will display a generic error message: Can't Save Record.
Admin Email Notification
The Admin user will also be sent a Flow Error email. The email will contain more information about why the error occurred. For this specific issue, the email will let you know that the record could not be saved due to exceeding 255 characters in the Comments field.