Samsung started rolling out Oreo today for S8 and S8 plus to beta testers in Germanymeaning it will be released to the public probably tomorrow or day after
it's probably the update, you can wait for the next software update maybe it will fix it or you can try to delete cache or do a factory reset itmostly helps
because you probably didn't download it in the first photo that button is not download, it's to save the picture to your favorite photos listto download a picture you have to long press the picture till the window (in second photo) appears
