diff --git a/tests/test_official/exceptions.py b/tests/test_official/exceptions.py
index fab6bf2861c..a6eb90dbd7e 100644
--- a/tests/test_official/exceptions.py
+++ b/tests/test_official/exceptions.py
@@ -96,6 +96,8 @@ class ParamTypeCheckingExceptions:
         },
         "Input(Paid)?Media.*": {
             "media": str,  # actual: Union[str, InputMedia*, FileInput]
+            # see also https://github.com/tdlib/telegram-bot-api/issues/707
+            "thumbnail": str,  # actual: Union[str, FileInput]
         },
         "EncryptedPassportElement": {
             "data": str,  # actual: Union[IdDocumentData, PersonalDetails, ResidentialAddress]