View Source ExTDLib.Method.SetChatPhoto (ExTDLib v0.0.4)

Changes the photo of a chat. Supported only for basic groups, supergroups and channels. Requires can_change_info administrator right. Returns object_ptr<Ok>.

NameTypeDescription
chat_idstringChat identifier.
photoInputChatPhotoNew chat photo; pass null to delete the chat photo.

More details on telegram's documentation.