diff --git a/src/Infrastructure/BotSharp.Abstraction/Files/Models/ExternalFileModel.cs b/src/Infrastructure/BotSharp.Abstraction/Files/Models/ExternalFileModel.cs
index d1efe0c7..687d50d0 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Files/Models/ExternalFileModel.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Files/Models/ExternalFileModel.cs
@@ -4,4 +4,10 @@ public class ExternalFileModel : FileDataModel
 {
     [JsonPropertyName("file_url")]
     public string? FileUrl { get; set; }
+
+    /// <summary>
+    /// File data => format: "data:image/png;base64,aaaaaaaa"
+    /// </summary>
+    [JsonPropertyName("file_data")]
+    public new string? FileData { get; set; }
 }