Ushahidi report and other datatypes can be uploaded and downloaded using the admin interface, Ushahidi API and DownloadReports plugin.
If you're uploading reports to Ushahidi via the admin interface, these pages are useful: CSV upload guide and XML upload guide; if you're uploading old datasets, please note that the format of CSV report data has changed since Ushahidi version 1, and may need to be reformatted.
This will only happen if you download and activate the plugin, or activate the public API.