OK, I found that MS OneDrive (the old SkyDrive), when synced to its Android app preserves the actual created/modified date, and has a built-in Sort function, by Date/Newest for example. Imperfectly executed but better than nothing (Dropbox or Google).
EDIT AFTER 2500 PHOTOS: the built-in Sort function, by Date/Newest/Oldest is only an ~approximation~ of native Windows Detail View by date. This needs a geek or team to look at it and figure out the glitches - or if no glitches, explain to the user how to get a better date sort.
THIS IS WHAT I WROTE BEFORE: Unlike Dropbox, which changes the file dates to the synced date, this preserves the actual created/modified date, and has a built-in Sort function, by Date/Newest for example. That's very important to me, which is why 4 stars. After I try it with hundreds of photos instead of a test run of 4, I may give it 5 stars. HEY MS, if you're watching reviews, you need a much better/bigger/updated snapshot here of the sorting choices. Also, during the install it allows a choice of automatically adding one's phone-cam photos to OneDrive. Not too big of a deal BUT that also doubles one's free cloud storage from 15GB to 30GB.
Also, I found this helpful. I cannot yet post links so you know what to do:
Force OneDrive to sort your files in a specific order across all your devices | PCWorld