u/Rkittu

I'm a citizen of India, and I'm planning to visit China to attend a scientific conference. After I filed my online application for an F (Exchange) visa, I got an email saying my application was un-approved, but no reason was given for why. The cryptic email says "Your application form No. xxx is unapproved. Please check application documents in accordance with the requirements of Embassy/Consulate General." I am befuddled, because the online form only asked for 4 documents, including a formal letter from the person who invited me, all of which I uploaded. Would anyone know what the reason for "un-approval" could be?