to adrian m h thanks for responding this has been my first attempt to contribute to wikipedia maybe my eyesight or concentration is lapsing i did get as far as clicking the upload button after which the 'empty file' response appeared my intent had been to upload an article as a file about prime numbers etc in the mathematics primes section having written it edited it saved the page approved the preview and entered the article's title as the source destination and summary what have i not done or done wrong thanks mif threshold pilot