diff --git a/src/main.rs b/src/main.rs
index 47f1f72..2d8649c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -339,6 +339,7 @@ async fn upload_file(
         let is_video = file_type.starts_with("video/")
             || file_name.ends_with(".mp4")
             || file_name.ends_with(".gif")
+            || file_name.ends_with(".mkv")
             || file_name.ends_with(".webm");
         if is_video {
             let mut final_tag_set = HashSet::new();