UKVCAS Biometrics Appointment Booking Help

I recently applied for the Skilled Worker visa (in-country) for change of employment (switching) using a priority service. I performed the following activities during the application submission process:

• Paid the IHS surcharge

• Paid the visa fee

• Submitted the application

• Uploaded evidence

However, at no stage I was asked to enrol for the biometrics appointment. Please can someone confirm if a biometric appointment is required, in which case please could you guide me how to enrol for it.

If the biometrics are required, please can I check if I can do biometrics on the app. I know the Home Office started an app based biometric process in 2020 due to Covid. Is this still going on? Can someone let me know regarding this as well please.
Thanks in advance.