We have two sets of screenshot images for 5.5 and 6.5 displays of the iOS app which needs a new version. When I first uploaded the screenshot set for the 6.5 display, it looks all good. Then I uploaded another set for the 5.5 display and headed back to check 6.5 images. I found some of them reported errors IMAGE_TOOL_FAILURE. Then I deleted all 6.5 screenshots, re-uploaded for the 6.5 display again. However, this time 5.5 had errors. It is like a loop. I tried tens of times. And, if I upload 6.5 first, it all looks good. And then I go to another tab, for example, the app information tab and then come back. I also find the images are marked as 'The file has been uploaded and is processing ' .