Synchronizing files between your devices is a two step process. First, you start the sync process by uploading from the device where the report was last updated. This uploads it to the cloud. Then, run the sync process by downloading the report on the device where you want to continue working on the report. This downloads the file from the cloud.
If you attempt to upload a file that already exists on the cloud with the same file name, you are prompted to choose which data you want to keep. You can choose to keep both files, stop the upload process, or replace the existing copy on the cloud with the copy you are currently uploading.