If you have uploaded your class lists and you can see the files are listed in the Files Uploaded section, the file has been successfully uploaded. The immunisations team will be able to download the file from their side of the portal.
If in the files uploaded section, you see a message in the status column process failed, this doesn't mean that your file has not been successfully uploaded.
Please note that once you have uploaded a file, you are not able to delete it. If for any reason you need to amend a file, we recommend uploading it again with the amendments and renaming it in a way the Immunisation team can see this file is the updated version.