Make sure the client you are using is set to use nostr.build (nip96). This includes Damus, YakiHonne, Amethyst, Snort, Iris, Coracle, and some others. If your client supports Blossom (ex. Primal) use blossom.nostr.build (or Blossom.band) If possible use the native nip96 integration. blossom is more common, but also more limited in upload size and features, but all will still automatically upload to your acct.