Hello kilwarecollector, welcome.
Pictures may be off a bit by either the file size, must be less than 100 KB in size on disk, or . .
. . the file name three letter extension, the picture Must be of the lower-case letters .jpg format, not .JPG or .jpeg or .Jpg, let alone and .png or new-type of pictures (althought hat would save space somewhat probably.
Other than that, hmmm? Please describe exactly what you are doing perhaps?