Can your digital camera be used as a photo viewer?

I thought I tried this once in my Lumix, and it could not recognized
the JPEG files. I wonder if others ever try and whether it works only
for certain cameras. I did not try it desperately, and perhaps I did
not place the JPEG files in the right folder of my camera card. Or
perhaps I need to rename the photos so that they should follow the
name conventional system of the camera (such as DSC for Sony, P for
Panasonic, etc). Thanks for the discussion.

PS. What I mean by using the camera as a photo viewer is either:
1. A set of copy of downloaded JPG photos from the same camera, but
they have been retouched or modified (although they still called by
the same file names) OR
2. Completely obtain JPG files from anywhere and dump them in the
camera card and insert it into the camera, and hit the "view" button.

.

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