diff --git a/worker/src/server.js b/worker/src/server.js
index 88e5a26..256ca2d 100644
--- a/worker/src/server.js
+++ b/worker/src/server.js
@@ -900,6 +900,57 @@ function parseDomEmojiUrl(value) {
   }
 }
 
+function domMediaPrefixForUrl(value) {
+  const raw = String(value || "");
+  if (isDomDownloadUrl(raw)) return domDownloadPrefix;
+  if (isDomAudioUrl(raw)) return domAudioPrefix;
+  if (isDomStickerUrl(raw)) return domStickerPrefix;
+  if (isDomEmojiUrl(raw)) return domEmojiPrefix;
+  return null;
+}
+
+function parseDomMediaUrl(value) {
+  const prefix = domMediaPrefixForUrl(value);
+  if (!prefix) {
+    return null;
+  }
+
+  try {
+    return JSON.parse(decodeURIComponent(String(value).slice(prefix.length)));
+  } catch {
+    return null;
+  }
+}
+
+function attachDomMediaChatContext(value, externalChatId, chatUrl) {
+  const prefix = domMediaPrefixForUrl(value);
+  if (!prefix) {
+    return value;
+  }
+
+  const parsed = parseDomMediaUrl(value);
+  if (!parsed) {
+    return value;
+  }
+
+  const next = {
+    ...parsed,
+    externalChatId: parsed.externalChatId || externalChatId || null,
+    chatUrl: normalizeMaxChatUrl(parsed.chatUrl) || normalizeMaxChatUrl(chatUrl) || null
+  };
+  return `${prefix}${encodeURIComponent(JSON.stringify(next))}`;
+}
+
+async function ensureDomMediaChatContext(p, request) {
+  const externalChatId = String(request?.externalChatId || "").trim();
+  const chatUrl = normalizeMaxChatUrl(request?.chatUrl);
+  if (!externalChatId && !chatUrl) {
+    return;
+  }
+
+  await ensureDomChatOpen(p, externalChatId, 5000, false, chatUrl);
+}
+
 function isPrivateHost(hostname) {
   const host = String(hostname || "").toLowerCase();
   if (!host || host === "localhost" || host.endsWith(".localhost")) return true;
@@ -913,20 +964,28 @@ function isPrivateHost(hostname) {
 
 async function fetchMediaThroughMaxSession(p, mediaUrl) {
   if (isDomDownloadUrl(mediaUrl)) {
-    return await downloadDomAttachmentThroughClick(p, parseDomDownloadUrl(mediaUrl));
+    const request = parseDomDownloadUrl(mediaUrl);
+    await ensureDomMediaChatContext(p, request);
+    return await downloadDomAttachmentThroughClick(p, request);
   }
 
   if (isDomAudioUrl(mediaUrl)) {
-    return await downloadDomAudioThroughPlay(p, parseDomAudioUrl(mediaUrl));
+    const request = parseDomAudioUrl(mediaUrl);
+    await ensureDomMediaChatContext(p, request);
+    return await downloadDomAudioThroughPlay(p, request);
   }
 
   if (isDomStickerUrl(mediaUrl)) {
-    return await downloadDomStickerThroughScreenshot(p, parseDomStickerUrl(mediaUrl));
+    const request = parseDomStickerUrl(mediaUrl);
+    await ensureDomMediaChatContext(p, request);
+    return await downloadDomStickerThroughScreenshot(p, request);
   }
 
   if (isDomEmojiUrl(mediaUrl)) {
+    const request = parseDomEmojiUrl(mediaUrl);
+    await ensureDomMediaChatContext(p, request);
     return await downloadDomStickerThroughScreenshot(p, {
-      ...parseDomEmojiUrl(mediaUrl),
+      ...request,
       selector: "[data-testid*='emoji' i], [class*='emoji' i], [class*='lottie' i], [class*='emoticon' i], canvas, svg",
       kindLabel: "MAX emoji canvas",
       acceptSmall: true,
@@ -2906,10 +2965,14 @@ async function extractOpenChatHistory(p, requestedExternalChatId) {
         sentAt: orderedSentAt(message.sentAt),
         deliveryState: message.deliveryState || null,
         rect: message.rect || null,
-        attachments: (message.attachments || []).map((attachment, index) => ({
-          ...attachment,
-          externalId: `dommedia:${stableHash(externalId, messageExternalId, attachment.remoteUrl || attachment.externalId || "", String(index))}`
-        }))
+        attachments: (message.attachments || []).map((attachment, index) => {
+          const remoteUrl = attachDomMediaChatContext(attachment.remoteUrl, externalId, raw.url);
+          return {
+            ...attachment,
+            remoteUrl,
+            externalId: `dommedia:${stableHash(externalId, messageExternalId, remoteUrl || attachment.externalId || "", String(index))}`
+          };
+        })
       };
     })
   };