Uploading an asset means copying it from your file system to WorldServer. This can be useful if you want to update the source assets of a project that is already in progress. To upload multiple assets at the same time, place them in a .zip archive and WorldServer will extract them automatically during the upload.
If you want to update existing assets, make sure that the assets you upload have the same name as the existing ones. WorldServer will then replace (overwrite) the previous versions with the latest versions.
To check that your asset has been uploaded successfully, right-click the folder where you uploaded it, and then select Refresh.