Interesting. I emailed Amazon and received this reply:
Currently the unlimited photo storage benefit includes most major image file types: JPEG, GIF, (both animated and non-animated), most common TIFFs, RAW, PNG, and BMP.
This means at this time the .nef, .rw2 and .orf will be considered as unsupported format and will count against cloud drive storage limit.
For more information about Cloud Drive Photos & Videos file requirements, go to:
I've forwarded your comments as feedback to our Amazon Cloud Drive team that you want .NEF file type images to be included in the unlimited photo storage benefit so that they aren't counted against your Cloud Storage quota. We're adding more file types to the unlimited photo storage feature, and file types not compatible now may become compatible in the future.
Currently the unlimited photo storage benefit includes most major image file types: JPEG, GIF, (both animated and non-animated), most common TIFFs, RAW, PNG, and BMP.
This means at this time the .nef, .rw2 and .orf will be considered as unsupported format and will count against cloud drive storage limit.
For more information about Cloud Drive Photos & Videos file requirements, go to:
https://www.amazon.com/help/clouddrive/photos/filerequiremen...
I've forwarded your comments as feedback to our Amazon Cloud Drive team that you want .NEF file type images to be included in the unlimited photo storage benefit so that they aren't counted against your Cloud Storage quota. We're adding more file types to the unlimited photo storage feature, and file types not compatible now may become compatible in the future.