diff --git a/frontend/src/components/messages/MessageComposer.tsx b/frontend/src/components/messages/MessageComposer.tsx
index 9872be4d..50c71147 100644
--- a/frontend/src/components/messages/MessageComposer.tsx
+++ b/frontend/src/components/messages/MessageComposer.tsx
@@ -77,8 +77,8 @@ export default function MessageComposer({
       .filter((file): file is File => Boolean(file));
 
     const uniqueFiles = [...clipboardFiles, ...clipboardItemFiles].filter((file, index, files) => {
-      const signature = `${file.name}|${file.size}|${file.type}|${file.lastModified}`;
-      return files.findIndex((candidate) => `${candidate.name}|${candidate.size}|${candidate.type}|${candidate.lastModified}` === signature) === index;
+      const signature = `${file.name}|${file.size}|${file.type}`;
+      return files.findIndex((candidate) => `${candidate.name}|${candidate.size}|${candidate.type}` === signature) === index;
     });
 
     if (uniqueFiles.length > 0) {
@@ -261,4 +261,4 @@ export default function MessageComposer({
       )}
     </>
   );
-}
\ No newline at end of file
+}