Add another signature in Field service bookings form

Hello everyone,

Actually I need to add another signature field to the Resource booking  - Mobile' form 

I have added new field as Multi line with "Pen Control" and in Resco Woodford application I did add that field,

but the field appeared after as a normal multi text line field with no availability to take a signature with the touch screen.

Thank you so much in advance.

Regards,