1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/MimeUtils.java b/src/main/java/de/thedevstack/conversationsplus/utils/MimeUtils.java
index c1c40f92..fdf55d2d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/MimeUtils.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/MimeUtils.java
@@ -458,7 +458,7 @@ public final class MimeUtils {
         if (extension == null || extension.isEmpty()) {
             return null;
         }
-        return extensionToMimeTypeMap.get(extension);
+        return extensionToMimeTypeMap.get(extension.toLowerCase());
     }
     /**
      * Returns true if the given extension has a registered MIME type.