As /u/somebodytoshove tells it, the files seem to upload, but then when you actually look at the files listed, they’re only 4-megabytes in size – much smaller than they should be if they contained all the original raw data. But on downloading and checking them, they only contain the jpg preview portion of the raw file and not the original data.

[via Reddit]

PSA  Amazon Photos auto save might not be auto saving all of your raw files - 33