I wanted to let all users be aware before they waste time destroying their nice 8mp photos! (or huge panoramic photos) iOS 8 brought extensions to the photos app to enable you to edit using other apps right from the photos app. But I have recently been caught out with photos which have been downscaled and ruined. There is a limitation in the extensions set by Apple. This is around 2mp so all photos are downscaled the second you edit with a photos extension. Edits are non-destructive to the original files - this requires you to revert to the original and lose all editing. I found this out by studying the images on my mac and also iPhone apps such as Photo Investigator. This since been confirmed by a popular apps response to my email. "I'm sorry, this is because of the limits set by Apple - we have to reduce the photo resolution. If you don't want to lose photo resolution, we suggest you avoid using the Photos extension to edit your images." - camera360 This applies to all other apps too. Verdict So... Do not use extensions... (Additionally, something that is widely known - photo streams and shared photo streams are downscaled to around 2000 pixels square) Mobile Editing Workflow I'd recommend editing with your editing app of choice (VSCO Cam, Photoshop Express, Afterlight etc...) and importing via usb import to your Mac for Mobile editing. Desktop Editing Workflow and Sync'ed Libraries Or for desktop editing import originals via usb import, you can then have these on your iPhone after either by (1) Syncing events to your devices in iTunes, (2) iCloud Photo Library (3) Adobe CC & Lightroom (4) Cloud storage such as Box etc. iCloud Photo Library may well change this - however I am unsure how this works as yet. (You may have the problem that your either eating up device space storing all your high res images on your devices or storing low resolution versions and possibly editing only these low res versions? - I'm unsure whether these edits would be applied to your master library in the iCloud Photo Library especially when other apps are used) Myself - I am considering moving my library over to Adobe Lightroom or something - I am still unsure - its getting complicated!