You with all your questions!
1. You need to have at least one photo in your PhotoPass account, that's how the system knows to select and limit you to that one specific day. On the
MDE app, tap on the three bars at the top left of the screen. Select "PhotoPass" (NOT Memory Maker) and then choose a photo. The next screen will give you three options: 1. Unlimited downloads of Your Vacation Photos for $169.00, 2. Unlimited downloads of Your Photos for This Day for $69.00 and 3. Unlimited downloads of This Photo for $14.95. Choose the
second option and make sure the date you want is the one that is listed.
Once this has been done you are set to go. Everyone should be able to have photos taken. Photographers should scan from Magicbands.
2. It happens all the time, some MS are posted right away and others take more time. In regards to other photos those typically show up right away. Please note, you need to aware of which photos are taken. Some do get lost and if you do not keep track you might miss it.
Memory Maker One Day “entitlement window” begins at 6:00 a.m. Eastern Time on the day to which you plan to apply the entitlement and ends at 5:59 a.m. Eastern Time on the following day.
If it were me, I'd get a photo taken asap that way you're not trying to figure it out during the party.
There are PhotoPass locations at all four parks, from my understanding you should be able to see your photos there. Though I will admit, I never had to deal with that.