How do I push pdfs to a folder in sharepoint online?

public void UploadDocument(string siteURL, string documentListName,
string documentListURL, string documentName,

byte[] documentStream)
{

using (ClientContext clientContext = new ClientContext(siteURL))
{        

//Get Document List
List documentsList = clientContext.Web.Lists.GetByTitle(documentListName);

var fileCreationInformation = new FileCreationInformation();
//Assign to content byte[] i.e. documentStream

fileCreationInformation.Content = documentStream;
//Allow owerwrite of document

fileCreationInformation.Overwrite = true;
//Upload URL

fileCreationInformation.Url = siteURL + documentListURL + documentName;
Microsoft.SharePoint.Client.File uploadFile = documentsList.RootFolder.Files.Add(
    fileCreationInformation);

//Update the metadata for a field having name "DocType"
uploadFile.ListItemAllFields["DocType"] = "Favourites";

uploadFile.ListItemAllFields.Update();
clientContext.ExecuteQuery();

}
}

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