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The file may be being stored in
A. a format the camera can store in but can't read ? this is very unlikely!
B. a corrupted version of the format it is supposed to be stored in.
C. the camera is unable to read/decode the usual format, owing to breakage of the decoding or format recognition etc.
The best way to settle which of these three is the case, would be to take the card the pictures are stored on, to a computer, and try to read the pictures there.
- if the pictures read fine, (B) is not the case. And dependent upon what File Type the pictures recently taken turn out to be, it might be (A).
- if the pictures don't read fine on the computer either, then (B) may be the case very likely.