diff --git a/lib/src/main/java/org/asamk/signal/manager/internal/ManagerImpl.java b/lib/src/main/java/org/asamk/signal/manager/internal/ManagerImpl.java
index d5a72a88..72f16a95 100644
--- a/lib/src/main/java/org/asamk/signal/manager/internal/ManagerImpl.java
+++ b/lib/src/main/java/org/asamk/signal/manager/internal/ManagerImpl.java
@@ -835,6 +835,12 @@ public class ManagerImpl implements Manager {
             String attachment,
             boolean allowsReplies
     ) throws IOException, AttachmentInvalidException {
+        final var file = new File(attachment);
+        final var mimeType = MimeUtils.getFileMimeType(file);
+        if (mimeType.isEmpty() || (!mimeType.get().startsWith("image/") && !mimeType.get().startsWith("video/"))) {
+            throw new AttachmentInvalidException(attachment,
+                    new IOException("Stories only support image and video attachments"));
+        }
         final var uploadedAttachment = context.getAttachmentHelper().uploadAttachment(attachment);
         final var storyMessage = SignalServiceStoryMessage.forFileAttachment(account.getProfileKey().serialize(),
                 null,
diff --git a/src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java b/src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java
index de8df1f8..3de99600 100644
--- a/src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java
+++ b/src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java
@@ -544,7 +544,7 @@ public class DbusManagerImpl implements Manager {
 
     @Override
     public SendMessageResults sendStory(String attachment, boolean allowsReplies) {
-        return new SendMessageResults(0, Map.of());
+        throw new UnsupportedOperationException();
     }
 
     @Override