diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/Commands/ConfigurePreviewUrls.cs b/src/Squidex.Domain.Apps.Entities/Schemas/Commands/ConfigurePreviewUrls.cs
new file mode 100644
index 000000000..0ce6dbcf5
--- /dev/null
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/Commands/ConfigurePreviewUrls.cs
@@ -0,0 +1,16 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Collections.Generic;
+
+namespace Squidex.Domain.Apps.Entities.Schemas.Commands
+{
+    public sealed class ConfigurePreviewUrls : SchemaCommand
+    {
+        public Dictionary<string, string> PreviewUrls { get; set; }
+    }
+}
diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/Guards/GuardSchema.cs b/src/Squidex.Domain.Apps.Entities/Schemas/Guards/GuardSchema.cs
index 943c3791c..820bf7b21 100644
--- a/src/Squidex.Domain.Apps.Entities/Schemas/Guards/GuardSchema.cs
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/Guards/GuardSchema.cs
@@ -5,6 +5,7 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
@@ -118,6 +119,19 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Guards
             });
         }
 
+        public static void CanConfigurePreviewUrls(ConfigurePreviewUrls command)
+        {
+            Guard.NotNull(command, nameof(command));
+
+            Validate.It(() => "Cannot configure preview urls.", error =>
+            {
+                if (command.PreviewUrls == null)
+                {
+                    error("Preview Urls is required.", nameof(command.PreviewUrls));
+                }
+            });
+        }
+
         public static void CanPublish(Schema schema, PublishSchema command)
         {
             Guard.NotNull(command, nameof(command));
diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs b/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs
index 98913f9e3..871d04314 100644
--- a/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs
@@ -6,6 +6,7 @@
 // ==========================================================================
 
 using System;
+using System.Collections.Generic;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Infrastructure;
 
@@ -40,5 +41,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas
         string ScriptChange { get; }
 
         Schema SchemaDef { get; }
+
+        Dictionary<string, string> PreviewUrls { get; }
     }
 }
diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/SchemaGrain.cs b/src/Squidex.Domain.Apps.Entities/Schemas/SchemaGrain.cs
index 9ffda0930..2aff00cc3 100644
--- a/src/Squidex.Domain.Apps.Entities/Schemas/SchemaGrain.cs
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/SchemaGrain.cs
@@ -179,6 +179,14 @@ namespace Squidex.Domain.Apps.Entities.Schemas
                         ChangeCategory(c);
                     });
 
+                case ConfigurePreviewUrls configurePreviewUrls:
+                    return UpdateAsync(configurePreviewUrls, c =>
+                    {
+                        GuardSchema.CanConfigurePreviewUrls(c);
+
+                        ConfigurePreviewUrls(c);
+                    });
+
                 case DeleteSchema deleteSchema:
                     return UpdateAsync(deleteSchema, c =>
                     {
@@ -288,6 +296,11 @@ namespace Squidex.Domain.Apps.Entities.Schemas
             RaiseEvent(SimpleMapper.Map(command, new SchemaCategoryChanged()));
         }
 
+        public void ConfigurePreviewUrls(ConfigurePreviewUrls command)
+        {
+            RaiseEvent(SimpleMapper.Map(command, new SchemaPreviewUrlsConfigured()));
+        }
+
         public void Delete(DeleteSchema command)
         {
             RaiseEvent(SimpleMapper.Map(command, new SchemaDeleted()));
diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs b/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs
index 59aebd11e..6e8a837f3 100644
--- a/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs
@@ -6,6 +6,7 @@
 // ==========================================================================
 
 using System;
+using System.Collections.Generic;
 using System.Runtime.Serialization;
 using Squidex.Domain.Apps.Core;
 using Squidex.Domain.Apps.Core.Schemas;
@@ -55,6 +56,9 @@ namespace Squidex.Domain.Apps.Entities.Schemas.State
         [DataMember]
         public string ScriptChange { get; set; }
 
+        [DataMember]
+        public Dictionary<string, string> PreviewUrls { get; set; }
+
         [DataMember]
         public Schema SchemaDef { get; set; }
 
@@ -166,6 +170,11 @@ namespace Squidex.Domain.Apps.Entities.Schemas.State
             Category = @event.Name;
         }
 
+        protected void On(SchemaPreviewUrlsConfigured @event, FieldRegistry registry)
+        {
+            PreviewUrls = @event.PreviewUrls;
+        }
+
         protected void On(SchemaPublished @event, FieldRegistry registry)
         {
             SchemaDef = SchemaDef.Publish();
diff --git a/src/Squidex.Domain.Apps.Events/Schemas/SchemaPreviewUrlsConfigured.cs b/src/Squidex.Domain.Apps.Events/Schemas/SchemaPreviewUrlsConfigured.cs
new file mode 100644
index 000000000..3983af224
--- /dev/null
+++ b/src/Squidex.Domain.Apps.Events/Schemas/SchemaPreviewUrlsConfigured.cs
@@ -0,0 +1,18 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Collections.Generic;
+using Squidex.Infrastructure.EventSourcing;
+
+namespace Squidex.Domain.Apps.Events.Schemas
+{
+    [EventType(nameof(SchemaPreviewUrlsConfigured))]
+    public sealed class SchemaPreviewUrlsConfigured : SchemaEvent
+    {
+        public Dictionary<string, string> PreviewUrls { get; set; }
+    }
+}
diff --git a/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs b/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs
index 11d441abd..e9ef7f5e0 100644
--- a/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs
+++ b/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs
@@ -71,6 +71,11 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models
         /// </summary>
         public string ScriptChange { get; set; }
 
+        /// <summary>
+        /// The preview Urls.
+        /// </summary>
+        public Dictionary<string, string> PreviewUrls { get; set; }
+
         /// <summary>
         /// The list of fields.
         /// </summary>
diff --git a/src/Squidex/Areas/Api/Controllers/Schemas/SchemasController.cs b/src/Squidex/Areas/Api/Controllers/Schemas/SchemasController.cs
index 79271b493..3b42d6a8f 100644
--- a/src/Squidex/Areas/Api/Controllers/Schemas/SchemasController.cs
+++ b/src/Squidex/Areas/Api/Controllers/Schemas/SchemasController.cs
@@ -6,6 +6,7 @@
 // ==========================================================================
 
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
@@ -155,7 +156,6 @@ namespace Squidex.Areas.Api.Controllers.Schemas
         /// <param name="request">The schema object that needs to updated.</param>
         /// <returns>
         /// 204 => Schema has been updated.
-        /// 400 => Schema properties are not valid.
         /// 404 => Schema or app not found.
         /// </returns>
         [HttpPut]
@@ -169,6 +169,27 @@ namespace Squidex.Areas.Api.Controllers.Schemas
             return NoContent();
         }
 
+        /// <summary>
+        /// Update the preview urls.
+        /// </summary>
+        /// <param name="app">The name of the app.</param>
+        /// <param name="name">The name of the schema.</param>
+        /// <param name="request">The preview urls for the schema.</param>
+        /// <returns>
+        /// 204 => Schema has been updated.
+        /// 404 => Schema or app not found.
+        /// </returns>
+        [HttpPut]
+        [Route("apps/{app}/schemas/{name}/preview-urls")]
+        [ApiPermission(Permissions.AppSchemasUpdate)]
+        [ApiCosts(1)]
+        public async Task<IActionResult> PutPreviewUrls(string app, string name, [FromBody] Dictionary<string, string> request)
+        {
+            await CommandBus.PublishAsync(new ConfigurePreviewUrls { PreviewUrls = request ?? new Dictionary<string, string>() });
+
+            return NoContent();
+        }
+
         /// <summary>
         /// Update the scripts of a schema.
         /// </summary>
diff --git a/src/Squidex/app/shared/state/comments.state.ts b/src/Squidex/app/shared/state/comments.state.ts
index 1e45dab85..966fd8673 100644
--- a/src/Squidex/app/shared/state/comments.state.ts
+++ b/src/Squidex/app/shared/state/comments.state.ts
@@ -48,7 +48,7 @@ export class CommentsState extends State<Snapshot> {
         private readonly commentsService: CommentsService,
         private readonly dialogs: DialogService
     ) {
-        super({ comments: ImmutableArray.empty(), version: new Version('') });
+        super({ comments: ImmutableArray.empty(), version: new Version('-1') });
     }
 
     public load(): Observable<any> {
diff --git a/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/Guards/GuardSchemaTests.cs b/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/Guards/GuardSchemaTests.cs
index 27aacd8ab..6743bc7f9 100644
--- a/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/Guards/GuardSchemaTests.cs
+++ b/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/Guards/GuardSchemaTests.cs
@@ -466,6 +466,23 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Guards
             GuardSchema.CanReorder(schema_0, command);
         }
 
+        [Fact]
+        public void CanConfigurePreviewUrls_should_throw_exception_if_preview_urls_null()
+        {
+            var command = new ConfigurePreviewUrls { PreviewUrls = null };
+
+            ValidationAssert.Throws(() => GuardSchema.CanConfigurePreviewUrls(command),
+                new ValidationError("Preview Urls is required.", "PreviewUrls"));
+        }
+
+        [Fact]
+        public void CanConfigurePreviewUrls_should_not_throw_exception_if_valid()
+        {
+            var command = new ConfigurePreviewUrls { PreviewUrls = new Dictionary<string, string>() };
+
+            GuardSchema.CanConfigurePreviewUrls(command);
+        }
+
         [Fact]
         public void CanChangeCategory_should_not_throw_exception()
         {
diff --git a/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs b/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs
index cd880f849..b16a1fa97 100644
--- a/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs
+++ b/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs
@@ -225,6 +225,31 @@ namespace Squidex.Domain.Apps.Entities.Schemas
                 );
         }
 
+        [Fact]
+        public async Task ConfigurePreviewUrls_should_create_events_and_update_state()
+        {
+            var command = new ConfigurePreviewUrls
+            {
+                PreviewUrls = new Dictionary<string, string>
+                {
+                    ["Web"] = "web-url"
+                }
+            };
+
+            await ExecuteCreateAsync();
+
+            var result = await sut.ExecuteAsync(CreateCommand(command));
+
+            result.ShouldBeEquivalent(new EntitySavedResult(1));
+
+            Assert.Equal(command.PreviewUrls, sut.Snapshot.PreviewUrls);
+
+            LastEvents
+                .ShouldHaveSameEvents(
+                    CreateEvent(new SchemaPreviewUrlsConfigured { PreviewUrls = command.PreviewUrls })
+                );
+        }
+
         [Fact]
         public async Task Delete_should_create_events_and_update_state()
         {