It’s a way for a computer to ensure no two files have the same name.
This string is a UUID (Universally Unique Identifier). 8681C4AD-EDFA-46BD-90F6-AE0F8029992F.jpeg
It looks like you've shared a (8681C4AD-EDFA-46BD-90F6-AE0F8029992F.jpeg) rather than the image itself. It’s a way for a computer to ensure