diff --git a/src/IIIFPresentation/API.Tests/Converters/Streaming/S3StoredJsonProcessorTests.cs b/src/IIIFPresentation/API.Tests/Converters/Streaming/S3StoredJsonProcessorTests.cs
index ed92afb9..4420f7dd 100644
--- a/src/IIIFPresentation/API.Tests/Converters/Streaming/S3StoredJsonProcessorTests.cs
+++ b/src/IIIFPresentation/API.Tests/Converters/Streaming/S3StoredJsonProcessorTests.cs
@@ -1,4 +1,5 @@
 using System.Text;
+using API.Converters;
 using API.Converters.Streaming;
 using LateApexEarlySpeed.Xunit.Assertion.Json;
 
@@ -9,24 +10,38 @@ public class S3StoredJsonProcessorTests
     [Fact]
     public void ProcessJson_ChangesTopLevelId()
     {
-        const string requestSlug = "fnord/quark/4534";
+      const string requestSlug =
+        "0004_hierarchical_iiif_collection_2O71nF/0004_hierarchical_iiif_collection_child_PWZnry";
+      const int customerId = 52;
+      var urlRoots = new UrlRoots
+      {
+        BaseUrl = "http://localhost"
+      };
 
-        var result = GetProcessed(ManifestJsonWithId, new(requestSlug));
+      var result = GetProcessed(ManifestJsonWithId, new(requestSlug, customerId, urlRoots));
 
         JsonAssertion.Meet(root => root.IsJsonObject()
-                .HasProperty("id", p => p.IsJsonString().Equal($"managed:{requestSlug}")),
+            .HasProperty("id", p => p.IsJsonString().Equal(
+              $"http://localhost/52/{requestSlug}")),
             result);
     }
 
     [Fact]
     public void ProcessJson_AddsTopLevelId()
     {
-        const string requestSlug = "fnord/quark/4534";
+      const string requestSlug =
+        "0004_hierarchical_iiif_collection_2O71nF/0004_hierarchical_iiif_collection_child_PWZnry";
+      const int customerId = 52;
+      var urlRoots = new UrlRoots
+      {
+        BaseUrl = "http://localhost"
+      };
 
-        var result = GetProcessed(ManifestJsonWithoutId, new(requestSlug));
+      var result = GetProcessed(ManifestJsonWithoutId, new(requestSlug, customerId, urlRoots));
 
         JsonAssertion.Meet(root => root.IsJsonObject()
-                .HasProperty("id", p => p.IsJsonString().Equal($"managed:{requestSlug}")),
+            .HasProperty("id", p => p.IsJsonString().Equal(
+              $"http://localhost/52/{requestSlug}")),
             result);
     }
 
diff --git a/src/IIIFPresentation/API/Converters/Streaming/S3StoredJsonProcessor.cs b/src/IIIFPresentation/API/Converters/Streaming/S3StoredJsonProcessor.cs
index 33269f28..4e54ee1e 100644
--- a/src/IIIFPresentation/API/Converters/Streaming/S3StoredJsonProcessor.cs
+++ b/src/IIIFPresentation/API/Converters/Streaming/S3StoredJsonProcessor.cs
@@ -2,11 +2,16 @@
 
 namespace API.Converters.Streaming;
 
-public class S3StoredJsonProcessor(string requestSlug)
+public class S3StoredJsonProcessor(string requestSlug, int customerId, UrlRoots roots)
     : StreamingProcessorImplBase<S3StoredJsonProcessor.S3ProcessorCustomState>
 {
     private const string IdPropertyName = "id";
 
+    private string GeneratedId { get; } = new UriBuilder(roots.BaseUrl!)
+    {
+        Path = $"{customerId}/{requestSlug}"
+    }.Uri.ToString();
+
     #region Overrides of StreamingProcessorImplBase<S3ProcessorCustomState>
 
     public override object GetInitialState() => new S3ProcessorCustomState();
@@ -31,7 +36,7 @@ protected override void OnEndObject(ref Utf8JsonReader reader, Utf8JsonWriter wr
         if (reader.CurrentDepth == 0 && !currentState.IdSet)
         {
             writer.WritePropertyName(IdPropertyName);
-            writer.WriteStringValue($"managed:{requestSlug}");
+            writer.WriteStringValue(GeneratedId);
         }
 
         base.OnEndObject(ref reader, writer, ref currentState);
@@ -56,7 +61,7 @@ protected override void OnEndObject(ref Utf8JsonReader reader, Utf8JsonWriter wr
             currentState.IdSet = true;
 
             // Found id in the top-level object
-            return $"managed:{requestSlug}";
+            return GeneratedId;
         }
 
         return v;
diff --git a/src/IIIFPresentation/API/Features/Storage/Requests/GetHierarchicalCollection.cs b/src/IIIFPresentation/API/Features/Storage/Requests/GetHierarchicalCollection.cs
index 9881f297..ddb4732d 100644
--- a/src/IIIFPresentation/API/Features/Storage/Requests/GetHierarchicalCollection.cs
+++ b/src/IIIFPresentation/API/Features/Storage/Requests/GetHierarchicalCollection.cs
@@ -1,4 +1,5 @@
-using API.Converters.Streaming;
+using API.Converters;
+using API.Converters.Streaming;
 using API.Features.Storage.Helpers;
 using API.Features.Storage.Models;
 using API.Helpers;
@@ -9,18 +10,19 @@
 using MediatR;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Options;
-using Models.Database.Collections;
 using Models.Database.General;
 using Repository;
 using Repository.Helpers;
 
 namespace API.Features.Storage.Requests;
 
-public class GetHierarchicalCollection(int customerId, string slug) : IRequest<CollectionWithItems>
+public class GetHierarchicalCollection(int customerId, string slug, UrlRoots urlRoots) : IRequest<CollectionWithItems>
 {
     public int CustomerId { get; } = customerId;
 
     public string Slug { get; } = slug;
+
+    public UrlRoots UrlRoots { get; } = urlRoots;
 }
 
 public class GetHierarchicalCollectionHandler(PresentationContext dbContext, IBucketReader bucketReader, 
@@ -49,7 +51,8 @@ public async Task<CollectionWithItems> Handle(GetHierarchicalCollection request,
                     using var memoryStream = new MemoryStream();
                     using var reader = new StreamReader(memoryStream);
                     StreamingJsonProcessor.ProcessJson(objectFromS3.Stream, memoryStream,
-                        objectFromS3.Headers.ContentLength, new S3StoredJsonProcessor(request.Slug));
+                        objectFromS3.Headers.ContentLength,
+                        new S3StoredJsonProcessor(request.Slug, request.CustomerId, request.UrlRoots));
                     memoryStream.Seek(0, SeekOrigin.Begin);
                     collectionFromS3 = await reader.ReadToEndAsync(cancellationToken);
                 }
diff --git a/src/IIIFPresentation/API/Features/Storage/StorageController.cs b/src/IIIFPresentation/API/Features/Storage/StorageController.cs
index 48b452f1..2e57253c 100644
--- a/src/IIIFPresentation/API/Features/Storage/StorageController.cs
+++ b/src/IIIFPresentation/API/Features/Storage/StorageController.cs
@@ -36,7 +36,7 @@ public class StorageController(IAuthenticator authenticator, IOptions<ApiSetting
     [VaryHeader]
     public async Task<IActionResult> GetHierarchicalCollection(int customerId, string slug = "")
     {
-        var storageRoot = await Mediator.Send(new GetHierarchicalCollection(customerId, slug));
+        var storageRoot = await Mediator.Send(new GetHierarchicalCollection(customerId, slug, GetUrlRoots()));
 
         if (storageRoot.Collection is not { IsPublic: true }) return this.PresentationNotFound();