Board Thread:Editing Discussions/@comment-27404978-20160307181108/@comment-6697950-20160307182536

You most likely tried to upload a file that was saved in a different format than you indicated in the file extension. For example, you saved an image in JPG format, but you tried uploading it under the title Image.png. An image must be saved in the format that you want to upload - if you're trying to upload a new revision for a file, you must upload it in the format indicated in the file name; if you're trying to upload a new image, the part of the name after the dot must match the format that the file was saved in.