Does Disney allocate additional FP+?

Walt Disney World Touring Plans
1

I’ve made my 3 FP+ reservations for a future trip. Some attractions didn’t have FP+ available for the time I wanted and some attractions were not available at any time.

Should I check back occasionally in case disney allocates more FP+? Does this ever happen?

2

You should check back often, people cancel FPs all the time and they become available. Play around with the times and you’ll see new options popping up.