Deleted folder after Marshmallow update


Hello, I updated Android to Marshmallow on m'y gfs phone and 2 folders had their pictures missing after the update. I found it weird that it happened only to 2 folders but then I remembered those had emotes in their names before the update (like hearts and animals) so I'm guessing something went wrong because of that. Now I van only see the folder with names trimmed of the emotes, and they're empty. Same on the PC when I connect my phone. Do you have any ideas how I can retrieve the old folders/pics ?