There are a couple of things that might prevent an image from successfully uploading. First, you will want to check the browser you are using. Chrome and Firefox often work best, and you will want to make sure that you are using the latest version of the browser. If you are using Internet Explorer, your image will not upload. Internet Explorer is a discontinued browser platform, and Microsoft has stopped providing usage and security updates for it. An alternative to this would be Firefox or Chrome, as mentioned above, or Microsoft Edge.
The other thing that might be causing issues with an upload is the file size or resolution. We have a couple of upload limits in place, so if your file exceeds those limits, you will not be able to upload the file. The upload limits are 100MB (the file size in bytes) and 100MP (the file resolution in pixels). If your file is over either limit, please contact us and we will let you know how best to adjust the file without compromising image quality.