Board Thread:Support Requests - Getting Technical/@comment-896291-20140625091619/@comment-3026053-20140625092927

When you upload a file over another, you have to stay within the same extension, meaning that you can only overwrite a png file with another png file and a jpg file with another jpg file. If you get that message, it means you likely tried to upload a png file over a jpg or a jpg over a png file (or some other extension).