diff --git a/packages/iios-messaging-ui/package.json b/packages/iios-messaging-ui/package.json
index 69ac4b7..a36ef95 100644
--- a/packages/iios-messaging-ui/package.json
+++ b/packages/iios-messaging-ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@insignia/iios-messaging-ui",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "type": "module",
   "main": "dist/index.js",
   "module": "dist/index.js",
diff --git a/packages/iios-messaging-ui/src/components/composer.tsx b/packages/iios-messaging-ui/src/components/composer.tsx
index 56c50ec..0437cfa 100644
--- a/packages/iios-messaging-ui/src/components/composer.tsx
+++ b/packages/iios-messaging-ui/src/components/composer.tsx
@@ -38,6 +38,7 @@ export function Composer({
   const [sending, setSending] = useState(false);
   const [staged, setStaged] = useState<Attachment | null>(null);
   const [uploading, setUploading] = useState(false);
+  const [uploadingName, setUploadingName] = useState<string | null>(null);
   const fileRef = useRef<HTMLInputElement>(null);
 
   const query = trailingMentionQuery(draft);
@@ -59,12 +60,14 @@ export function Composer({
     e.target.value = '';
     if (!file) return;
     setUploading(true);
+    setUploadingName(file.name);
     try {
       setStaged(await upload(file));
     } catch {
       /* host surfaces upload errors */
     } finally {
       setUploading(false);
+      setUploadingName(null);
     }
   }
 
@@ -110,7 +113,11 @@ export function Composer({
           ))}
         </ul>
       ) : null}
-      {staged ? (
+      {uploading && uploadingName ? (
+        <div className="miu-staged is-uploading">
+          <span className="miu-spinner" aria-hidden="true" /> {uploadingName} · uploading…
+        </div>
+      ) : staged ? (
         <div className="miu-staged">
           📎 {staged.name}
           <button type="button" className="miu-staged-x" onClick={() => setStaged(null)} aria-label="Remove attachment">
diff --git a/packages/iios-messaging-ui/src/inbox/inbox.tsx b/packages/iios-messaging-ui/src/inbox/inbox.tsx
index 3587b6c..a4e42b2 100644
--- a/packages/iios-messaging-ui/src/inbox/inbox.tsx
+++ b/packages/iios-messaging-ui/src/inbox/inbox.tsx
@@ -122,6 +122,7 @@ export function MailReader({ threadId, subject }: { threadId: string; subject: s
   const [sending, setSending] = useState(false);
   const [pending, setPending] = useState<MailAttachment | null>(null);
   const [attaching, setAttaching] = useState(false);
+  const [uploadingName, setUploadingName] = useState<string | null>(null);
   const [attachErr, setAttachErr] = useState<string | null>(null);
   const fileRef = useRef<HTMLInputElement>(null);
 
@@ -139,6 +140,7 @@ export function MailReader({ threadId, subject }: { threadId: string; subject: s
     e.target.value = '';
     if (!file) return;
     setAttaching(true);
+    setUploadingName(file.name);
     setAttachErr(null);
     try {
       setPending(await upload(file));
@@ -146,6 +148,7 @@ export function MailReader({ threadId, subject }: { threadId: string; subject: s
       setAttachErr(err instanceof Error ? err.message : String(err));
     } finally {
       setAttaching(false);
+      setUploadingName(null);
     }
   }
 
@@ -198,7 +201,11 @@ export function MailReader({ threadId, subject }: { threadId: string; subject: s
       </div>
       <form className="miu-composer" onSubmit={submit}>
         {attachErr ? <div className="miu-empty miu-error">{attachErr}</div> : null}
-        {pending ? (
+        {attaching && uploadingName ? (
+          <div className="miu-attach-pending">
+            <span className="miu-attach-chip is-uploading"><span className="miu-spinner" aria-hidden="true" /> {uploadingName} · uploading…</span>
+          </div>
+        ) : pending ? (
           <div className="miu-attach-pending">
             <span className="miu-attach-chip">📎 {pending.filename ?? 'attachment'}{pending.sizeBytes ? ` · ${fmtBytes(pending.sizeBytes)}` : ''}</span>
             <button type="button" className="miu-attach-x" onClick={() => setPending(null)} aria-label="Remove attachment">✕</button>
@@ -232,6 +239,7 @@ function ComposeModal({ onClose, onSent }: { onClose: () => void; onSent: () =>
   const [err, setErr] = useState<string | null>(null);
   const [attachments, setAttachments] = useState<MailAttachment[]>([]);
   const [attaching, setAttaching] = useState(false);
+  const [uploadingName, setUploadingName] = useState<string | null>(null);
   const fileRef = useRef<HTMLInputElement>(null);
 
   const filtered = compose.directory.filter((p) => p.name.toLowerCase().includes(q.trim().toLowerCase()));
@@ -242,6 +250,7 @@ function ComposeModal({ onClose, onSent }: { onClose: () => void; onSent: () =>
     e.target.value = '';
     if (!file || attachments.length >= 10) return;
     setAttaching(true);
+    setUploadingName(file.name);
     setErr(null);
     try {
       const ref = await compose.upload(file);
@@ -250,6 +259,7 @@ function ComposeModal({ onClose, onSent }: { onClose: () => void; onSent: () =>
       setErr(e2 instanceof Error ? e2.message : String(e2));
     } finally {
       setAttaching(false);
+      setUploadingName(null);
     }
   }
 
@@ -323,9 +333,14 @@ function ComposeModal({ onClose, onSent }: { onClose: () => void; onSent: () =>
                     <button type="button" className="miu-attach-x" onClick={() => setAttachments((prev) => prev.filter((_, j) => j !== i))} aria-label="Remove attachment">✕</button>
                   </span>
                 ))}
+                {attaching && uploadingName ? (
+                  <span className="miu-attach-pending">
+                    <span className="miu-attach-chip is-uploading"><span className="miu-spinner" aria-hidden="true" /> {uploadingName} · uploading…</span>
+                  </span>
+                ) : null}
                 <input ref={fileRef} type="file" hidden onChange={pick} aria-label="Attach file" />
                 <button type="button" className="miu-tab" onClick={() => fileRef.current?.click()} disabled={attaching || attachments.length >= 10}>
-                  {attaching ? 'Uploading…' : '📎 Attach'}
+                  📎 Attach
                 </button>
               </div>
             </div>
diff --git a/packages/iios-messaging-ui/src/styles.css b/packages/iios-messaging-ui/src/styles.css
index 68f0d5f..34e0776 100644
--- a/packages/iios-messaging-ui/src/styles.css
+++ b/packages/iios-messaging-ui/src/styles.css
@@ -368,6 +368,25 @@ button.miu-attach-dl:hover {
   align-items: center;
   gap: 6px;
 }
+.miu-attach-chip.is-uploading,
+.miu-staged.is-uploading {
+  color: var(--miu-muted);
+}
+.miu-spinner {
+  display: inline-block;
+  width: 12px;
+  height: 12px;
+  border: 2px solid var(--miu-border);
+  border-top-color: var(--miu-accent);
+  border-radius: 50%;
+  animation: miu-spin 0.7s linear infinite;
+}
+@keyframes miu-spin {
+  to { transform: rotate(360deg); }
+}
+@media (prefers-reduced-motion: reduce) {
+  .miu-spinner { animation-duration: 2s; }
+}
 .miu-attach-x {
   border: none;
   background: none;