plz help ...cant see lock gallery image

plz help me guys..cant see my lock images in gallery...
i used lg g3 and lock image ...and these lock image copy in pc,,.
jpeg.dm format..and now used lg g4 and copy those image in new mobile..but cant see....how can i see these image in lg g4

from xda-developers http://ift.tt/28PxYmc
via IFTTT