After trying to deliver several orders to different buyers, both sides received the error message “failed to upload.” Fiverr’s help was next to useless, but I finally figured it out on my own. I write on both a PC and a Mac, with files saved to Dropbox. The versions that I finished in MS Word for Mac (2010), though, would not upload. The workaround is to open the Mac version on a PC. It re-formats the document and uploads without a hitch. But Fiverr needs to fix this flaw.