Please upload the "Cover Letter" explaining the response to reviewers or editor's comments in .docx, .doc or .pdf formats. Uploading a cover letter is a required field. You can upload more than one files by clicking on "Add file" button. Once file is selected click on "Update" to upload and save the file. All uploaded files will appear in donwloadable format just below the Cover Letter green strip. Once the required file(s) are uploaded, click on "Skip" which will take you to the next step.