My sister arrived at WDW yesterday, got Platinum APs for her whole family. She's been at MK for 1.5 days now, and no ride photos have shown up in her account, except for Buzz Lightyear's Space Ranger Spin (and does that even count, as you get those photos regardless of whether or not you have photo entitlements? Or are the monitors after the ride to email yourself the pics gone now?).
Our extended family all shared MM last year, and from the looks of it thus far, this isn't working the same way. Or if it's supposed to work the same way, there's glitches at this point. My nephew had his band scanned for some pics in front of the castle, and those haven't shown up in my sister's account. He doesn't have his own account, being young, so I would have expected that his mom could see those pics.