Welcome to the community, Benjamin! :grinning_face_with_big_eyes: It works for numeric fields, but not for single line text fields. If this sequence is going to continue indefinitely, I would suggest using a formula.
First make an autonumber field, which will give you an automatic numeric sequence beginning at 1. Then add a formula field with this formula (replace “Autonumber” with the name you gave your autonumber field):
"UF-" & (3100 + Autonumber)
No need to drag anything, as Airtable will continue incrementing the number each time you make a new record.