Gets a relative path to this user-selected file on the client machine.
public function getRelativePath() {
}
Type: string
The relative path to this user-selected file.
This property makes sense only if the folder upload feature is turned on (Uploader.FolderProcessingMode is upload)
and the user-selected file is located inside a subfolder. In that case this property contains a relative path to this file and the SourceName
represents its filename. For example, if the user sends a My Documents\My Photos\00001.jpg file its SourceName_i POST field
will contain My Documents\My Photos\00001.jpg value. However, the RelativePath property will contain My Documents\My Photos\ value.