Please ensure that your figures are in any of the acceptable file formats. The size of your figures is also a factor for failures. We recommend that figures are not larger that 10 MB and if you have several figures these should not be more than 7 MB each to ensure ease of upload. If your figures are larger than that, you may need to save them in a different format. Often journals have an individual limit on file size. Please check the journal's guide for authors for this information. If you still cannot upload your figures, please contact us and let us know the size and type of files.