diff --git a/jam-ui/src/components/client/JKSessionJamTrackPlayer.js b/jam-ui/src/components/client/JKSessionJamTrackPlayer.js
index 900f603b4..e405dd969 100644
--- a/jam-ui/src/components/client/JKSessionJamTrackPlayer.js
+++ b/jam-ui/src/components/client/JKSessionJamTrackPlayer.js
@@ -88,9 +88,9 @@ const JKSessionJamTrackPlayer = ({
           // Download flow will be triggered by loadJamTrack (no diagnostic logging)
         }
 
-        // Fetch available mixdowns
+        // Use mixdowns from jamTrack object (fetched from REST API with packages)
         try {
-          const mixdowns = await jamClient.JamTrackGetMixdowns(jamTrack.id);
+          const mixdowns = jamTrack.mixdowns;
 
           if (mixdowns && mixdowns.length > 0) {
             // Organize into hierarchy: master, custom mixes, stems
@@ -118,7 +118,7 @@ const JKSessionJamTrackPlayer = ({
             }
           }
         } catch (err) {
-          console.error('[JamTrack] Failed to fetch mixdowns:', err);
+          console.error('[JamTrack] Failed to load mixdowns:', err);
           // Non-fatal - can still play default mixdown
         }
 
diff --git a/jam-ui/src/store/features/mediaSlice.js b/jam-ui/src/store/features/mediaSlice.js
index 15b110e39..0ad29bfd8 100644
--- a/jam-ui/src/store/features/mediaSlice.js
+++ b/jam-ui/src/store/features/mediaSlice.js
@@ -62,20 +62,25 @@ export const downloadJamTrack = createAsyncThunk(
       // Get client sample rate for package selection (pickMyPackage logic)
       const sampleRate = await jamClient.GetSampleRate();
 
-      // Get mixdowns and find compatible package
-      const mixdowns = await jamClient.JamTrackGetMixdowns(jamTrack.id);
+      // Use mixdowns from jamTrack object (fetched from REST API)
+      // jamClient.JamTrackGetMixdowns returns a different structure without packages
+      const mixdowns = jamTrack.mixdowns;
 
       if (!mixdowns || mixdowns.length === 0) {
         throw new Error('No mixdowns available for this JamTrack');
       }
 
-      // Find the first mixdown (use selected mixdownId if provided, else use first)
+      // Find the mixdown (use selected mixdownId if provided, else use first)
       const mixdown = mixdownId
         ? mixdowns.find(m => m.id === mixdownId) || mixdowns[0]
         : mixdowns[0];
 
-      if (!mixdown || !mixdown.packages || mixdown.packages.length === 0) {
-        throw new Error('Mixdown has no packages available');
+      if (!mixdown) {
+        throw new Error('Selected mixdown not found');
+      }
+
+      if (!mixdown.packages || mixdown.packages.length === 0) {
+        throw new Error(`Mixdown "${mixdown.name}" has no packages available`);
       }
 
       // pickMyPackage logic: find compatible package (ogg, jkz, matching sample rate)
@@ -86,7 +91,7 @@ export const downloadJamTrack = createAsyncThunk(
       );
 
       if (!compatiblePackage) {
-        throw new Error(`No compatible package found for sample rate ${sampleRate}kHz`);
+        throw new Error(`No compatible package found for sample rate ${sampleRate}kHz (mixdown: ${mixdown.name})`);
       }
 
       const packageId = compatiblePackage.id;