I can't export one of my Photoshop files as a PNG. When I click Export As, it says "An unknown error occured." When I quick export, I go through the dialogues just fine but the file doesn't show up. I know it sometimes takes a while to appear but not this long. (1 hour+ and still no file to be found). I have tried restarting my computer, reinstalling Photoshop, and resetting Photoshop export preferences. Only one file has been affected like this.