The FS Lore has the death depicted? Would be a good idea to push something like what Facebook does with people who has deceased. A little space to leave condolences and good words for the ones that arent with us anymore.
You need to save them on GIF format(on Photoshop), remember to save them through the legacy option (halo 0%, transparency depending on what you are doing) and in the top are 2 options, Original or Optimized, you can change that too.
Once you have your GIF file, you need to convert it to APNG, how do you do it? Through online apps, I recommend aconvert, good, easy, and works great with the FS system of avatars.