I will be purchasing AP's for our June trip and wonder if I can still use FP+ while they are in voucher form??? I already have 5 day tickets purchased but wanted to change those to AP's. If I do that prior to arrival I will only have the voucher. Can the voucher number be linked through MDX? We already have bands from our Oct. trip when we were AP holders. Anyone experience this yet? Or should I just upgrade them the last day we are there?