A lot of sites are starting to use the webp format instead of the gif and jpeg or jpg formats. Unfortunately, I can not download an image in the webp format on my fone let alone attach one to my text message if my fone says I did download it. If my fone says I did download one, I am unable to view it in my Gallery Album.
My fone is a Samsung Galaxy S7 (SM-G930V) running Android version 7 with update G930VVRS4BRA1.
Well, I never got an answer from Verizon or a satisfactory answer when I called, but this link pretty much sums up what webp format is and why it has extremely little support outside of Google's apps: