diff --git a/Definitions/Web/Client.cs b/Definitions/Web/Client.cs
index 5b14082f..4ba1c3f5 100644
--- a/Definitions/Web/Client.cs
+++ b/Definitions/Web/Client.cs
@@ -43,4 +43,15 @@ public static async Task<IEnumerable<DtoObjectEntry>> GetObjectListAsync(HttpCli
 			RoutesV2.Objects,
 			request);
 	}
+
+	public static async Task<UniqueObjectId> AddMissingObjectAsync(HttpClient client, DtoMissingObjectEntry entry, ILogger? logger = null)
+	{
+		logger?.Debug($"Posting missing object {entry.DatName} with checksum {entry.DatChecksum} to {client.BaseAddress?.OriginalString}{RoutesV2.Objects}{RoutesV2.Missing}");
+		return await ClientHelpers.PostAsync<DtoMissingObjectEntry, UniqueObjectId>(
+			client,
+			ApiVersion,
+			RoutesV2.Objects + RoutesV2.Missing,
+			entry,
+			logger);
+	}
 }
diff --git a/Gui/ObjectServiceClient.cs b/Gui/ObjectServiceClient.cs
index a7101bb7..bec4fc57 100644
--- a/Gui/ObjectServiceClient.cs
+++ b/Gui/ObjectServiceClient.cs
@@ -69,4 +69,7 @@ public async Task<IEnumerable<DtoObjectEntry>> GetObjectListAsync()
 
 	public async Task<DtoObjectDescriptor?> UploadDatFileAsync(string filename, byte[] datFileBytes, DateOnly creationDate, DateOnly modifiedDate)
 		=> await Client.UploadDatFileAsync(WebClient, filename, datFileBytes, creationDate, modifiedDate, Logger);
+
+	public async Task<UniqueObjectId> AddMissingObjectAsync(DtoMissingObjectEntry entry)
+		=> await Client.AddMissingObjectAsync(WebClient, entry, Logger);
 }
diff --git a/Gui/ViewModels/LocoTypes/SCV5ViewModel.cs b/Gui/ViewModels/LocoTypes/SCV5ViewModel.cs
index 8bc3b125..2e0701f2 100644
--- a/Gui/ViewModels/LocoTypes/SCV5ViewModel.cs
+++ b/Gui/ViewModels/LocoTypes/SCV5ViewModel.cs
@@ -160,7 +160,24 @@ async Task DownloadMissingObjects(GameObjDataFolder targetFolder)
 
 			if (onlineObj == null)
 			{
-				logger.Error("Couldn't find a matching object in the online index");
+				logger.Error($"Couldn't find a matching object in the online index for {obj.ObjectType} \"{obj.Name}\" with checksum {obj.Checksum}");
+				
+				// Add this missing object to the server's missing objects list
+				var missingEntry = new Definitions.DTO.DtoMissingObjectEntry(
+					obj.Name,
+					obj.Checksum,
+					obj.ObjectType.Convert());
+				
+				var result = await Model.ObjectServiceClient.AddMissingObjectAsync(missingEntry);
+				if (result != 0)
+				{
+					logger.Info($"Successfully added missing object to server: {obj.Name} ({obj.Checksum})");
+				}
+				else
+				{
+					logger.Error($"Failed to add missing object to server: {obj.Name} ({obj.Checksum})");
+				}
+				
 				continue;
 			}
 
diff --git a/Tests/ObjectServiceIntegrationTests/BaseReferenceDataTableTestFixture.cs b/Tests/ObjectServiceIntegrationTests/BaseReferenceDataTableTestFixture.cs
index bf6b1bfa..c3c99937 100644
--- a/Tests/ObjectServiceIntegrationTests/BaseReferenceDataTableTestFixture.cs
+++ b/Tests/ObjectServiceIntegrationTests/BaseReferenceDataTableTestFixture.cs
@@ -22,16 +22,19 @@ public abstract class BaseRouteHandlerTestFixture
 	[Test] public abstract Task PutAsync();
 	[Test] public abstract Task DeleteAsync();
 
+	protected LocoDbContext GetDbContext()
+		=> testWebAppFactory
+			.Services
+			.CreateScope()
+			.ServiceProvider
+			.GetRequiredService<LocoDbContext>();
+
 	async Task SeedDataAsync()
 	{
-		using (var scope = testWebAppFactory.Services.CreateScope())
-		{
-			var dbContext = scope.ServiceProvider.GetRequiredService<LocoDbContext>();
+		using var dbContext = GetDbContext();
+		await SeedDataCoreAsync(dbContext);
+		_ = await dbContext.SaveChangesAsync();
 
-			// Seed data
-			await SeedDataCoreAsync(dbContext);
-			_ = await dbContext.SaveChangesAsync();
-		}
 	}
 
 	protected abstract Task SeedDataCoreAsync(LocoDbContext db);
diff --git a/Tests/ObjectServiceIntegrationTests/ObjectRoutesTest.cs b/Tests/ObjectServiceIntegrationTests/ObjectRoutesTest.cs
index f094a4ee..4bc31777 100644
--- a/Tests/ObjectServiceIntegrationTests/ObjectRoutesTest.cs
+++ b/Tests/ObjectServiceIntegrationTests/ObjectRoutesTest.cs
@@ -224,4 +224,33 @@ [new DtoDatObjectEntry(1, "AZVOG15C", 3072098364, 7051740550869341430, 3)], // d
 
 		AssertDtoObjectDescriptorsAreEqual(results, expected);
 	}
+
+	[Test]
+	public async Task AddMissingObjectAsync()
+	{
+		// arrange
+		var missingEntry = new DtoMissingObjectEntry("TESTOBJ1", 123456789, ObjectType.Vehicle);
+
+		// act
+		var result = await Client.AddMissingObjectAsync(HttpClient!, missingEntry, new Logger());
+
+		// assert
+		Assert.That(result, Is.Not.Zero, "Adding missing object should return the new unique id for that object");
+
+		// verify the object was added to the database
+		using var dbContext = GetDbContext();
+		var addedObject = await dbContext.Objects
+			.Include(x => x.DatObjects)
+			.FirstOrDefaultAsync(x => x.Name == $"{missingEntry.DatName}_{missingEntry.DatChecksum}");
+
+		using (Assert.EnterMultipleScope())
+		{
+			Assert.That(addedObject, Is.Not.Null, "Object should exist in database");
+			Assert.That(addedObject!.Availability, Is.EqualTo(ObjectAvailability.Missing));
+			Assert.That(addedObject.ObjectType, Is.EqualTo(ObjectType.Vehicle));
+			Assert.That(addedObject.DatObjects.Count, Is.EqualTo(1));
+			Assert.That(addedObject.DatObjects.First().DatName, Is.EqualTo(missingEntry.DatName));
+			Assert.That(addedObject.DatObjects.First().DatChecksum, Is.EqualTo(missingEntry.DatChecksum));
+		}
+	}
 }