I use 2 picking/strum patterns in different sections of the song:
The finger-string assignment is:
In order to sound like the original, you will need a ukulele with a low G string.
The picking pattern here is different for each of the chords: Bbsus#4, Ebm. Since you don't play the A string, you don't need to hold down a fret there.
Bbsus#4 Ebm A|------------------ E|--1-1------------2- C|-------4----3-3--- G|-3-3--3----3-3--3--
For Bbsus#4, hold down the chord shape 341x. The picking pattern is thumb - middle - thumb - middle, thumb - index.
For Ebm, hold down the chord shape 332x. The picking pattern is thumb - index, thumb - index, thumb - middle.
In each verse, there are 2 points where you don't finish the entire Ebm picking pattern. In the Ebm => F transition, pick the first 4 notes of the Ebm picking pattern, and then switch to a strum for the F chord. Similarly in the Ebm => D, G (transition from verse to chorus), pick the first 4 notes, and then switch to a strum for the D and G chords. The strum pattern used is the rock strum, which I'll describe in the next section.2. Rock strum - verse, chorus
The strum pattern used for the verse and chorus is the rock strum. A rock strum is characterized by an emphasis on the third beat. The verse and most of the chorus uses the basic rock strum.
1 2 3 4 d D du
For the Bm => C transition in the chorus, I play an extended rock strum. You can substitute the regular rock strum here. The extended rock strum I play is:
Bm C 1+2+3+4+1+2+3+4+ d D du ud D du