Regardless, if suddenly a file I've programmed to be set as wallpaper is missing, whatever task that is part of suddenly stops working (i.e. all the steps after that point stop).
I'm going to start moving that action to the end of the tasks if possible when it happens again, but it would be cool to have the option to click a box "continue after error" so I wouldn't suddenly lose function like this.
Yes, the file's always there when I first add it, but like I said, sometimes I forget to pick exceptions when my photos get too much and Google offers to thin them out.