Canwe upload files to the file cabinet?

Is it possible to upload files like images to the file cabinet? Ive used this code to try and upload one, the file gets uploaded but the image isnt viewable afterwards.

File uploadFile = new File();
                        byte[] data = new byte[findImage.Length];
                        uploadFile.content = data;
                        uploadFile.name = findImage.Name;
                        uploadFile.isOnline = true;
                        uploadFile.isOnlineSpecified = true;

                        RecordRef folderRef = new RecordRef();
                        folderRef.internalId = "1";
                        uploadFile.folder = folderRef;
                        WriteResponse fileResponse = service.add(uploadFile);