I've moved from the FMX Cloud Pack to FNC 3.0.0.4 and I'm still seeing this error when uploading to Dropbox.
This project is using Upload() and I'd like to try UploadResumableFile() but there is no documentation for its first parameter TTMSFNCCloudFile. The demo project does not use UploadResumableFile(). The Upload() method just needs a file name string.