diff --git a/src/Client.Helpers.cs b/src/Client.Helpers.cs
index a26210d..bdfb48f 100644
--- a/src/Client.Helpers.cs
+++ b/src/Client.Helpers.cs
@@ -36,9 +36,10 @@ namespace WTelegram
 			var client = await GetClientForDC(-_dcSession.DcID, true);
 			using (stream)
 			{
+				const long SMALL_FILE_MAX_SIZE = 10 << 20;
 				bool hasLength = stream.CanSeek;
 				long transmitted = 0, length = hasLength ? stream.Length : -1;
-				bool isBig = !hasLength || length >= 10 * 1024 * 1024;
+				bool isBig = !hasLength || length > SMALL_FILE_MAX_SIZE;
 				int file_total_parts = hasLength ? (int)((length - 1) / FilePartSize) + 1 : -1;
 				long file_id = Helpers.RandomLong();
 				int file_part = 0, read;
diff --git a/src/Client.cs b/src/Client.cs
index 2b302fe..08b6207 100644
--- a/src/Client.cs
+++ b/src/Client.cs
@@ -1238,10 +1238,13 @@ namespace WTelegram
 						if (verified is Account_EmailVerifiedLogin verifiedLogin) // (it should always be)
 							sentCodeBase = verifiedLogin.sent_code;
 					}
+					RaiseUpdates(sentCodeBase);
 				}
 			resent:
 				if (sentCodeBase is Auth_SentCodeSuccess success)
 					authorization = success.authorization;
+				else if (sentCodeBase is Auth_SentCodePaymentRequired paymentRequired)
+					throw new WTException("Auth_SentCodePaymentRequired unsupported");
 				else if (sentCodeBase is Auth_SentCode sentCode)
 				{
 					phone_code_hash = sentCode.phone_code_hash;
@@ -1410,7 +1413,7 @@ namespace WTelegram
 		public User LoginAlreadyDone(Auth_AuthorizationBase authorization)
 		{
 			if (authorization is not Auth_Authorization { user: User self })
-				throw new WTException("Failed to get Authorization: " + authorization.GetType().Name);
+				throw new WTException("Failed to get Authorization: " + authorization?.GetType().Name);
 			_session.UserId = _dcSession.UserId = self.id;
 			lock (_session) _session.Save();
 			RaiseUpdates(self);