Here is an article addressing the lack of the camera roll in iOS 8 and workaround for other apps until they are updated. The Photos app now has a Recently Added feature which only shows 30 days and the rest of your photos are in Collections.
Quote:
In Collections on iOS 8 you will see the all of your photos organized by date and location. You can scroll through these photos like you used to do in the Camera Roll but now you can search by location, date and other attributes to find the photos you want.
Unfortunately you cannot access Collections from inside many apps. This includes Instagram, Facebook, Twitter and Dropbox, but there are likely other apps impacted by the change.
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http://www.gottabemobile.com/2014/09...s-breaks-apps/