diff --git a/content/docs/ios/changelog.mdx b/content/docs/ios/changelog.mdx
index 74fd9f80..83259fa4 100644
--- a/content/docs/ios/changelog.mdx
+++ b/content/docs/ios/changelog.mdx
@@ -3,6 +3,18 @@ title: "Changelog"
 description: "Release notes for the Superwall iOS SDK"
 ---
 
+## 4.15.1
+
+### Enhancements
+
+- Adds an `onCustomCallback` parameter to `getPaywall`.
+- `SuperwallOptions.localResources` now accepts UIImage's from xcasset files, e.g. `UIImage(named: "my-image")`.
+- Exposes abandoned transaction product params in audience filters.
+
+### Fixes
+
+- Sanitizes email user attribute.
+
 ## 4.15.0
 
 ### Enhancements
diff --git a/content/docs/ios/index.mdx b/content/docs/ios/index.mdx
index e97b9368..a8a0d636 100644
--- a/content/docs/ios/index.mdx
+++ b/content/docs/ios/index.mdx
@@ -50,6 +50,6 @@ If you have feedback on any of our docs, please leave a rating and message at th
 If you have any issues with the SDK, please [open an issue on GitHub](https://github.com/superwall/superwall-ios/issues).
 
 <SdkLatestVersion
-  version="4.15.0"
+  version="4.15.1"
   repoUrl="https://github.com/superwall/Superwall-iOS"
 />
diff --git a/content/docs/ios/sdk-reference/SuperwallOptions.mdx b/content/docs/ios/sdk-reference/SuperwallOptions.mdx
index 92d05b0f..324389b5 100644
--- a/content/docs/ios/sdk-reference/SuperwallOptions.mdx
+++ b/content/docs/ios/sdk-reference/SuperwallOptions.mdx
@@ -29,7 +29,7 @@ public final class SuperwallOptions: NSObject {
   public var localeIdentifier: String?
   public var shouldBypassAppTransactionCheck: Bool
   public var testModeBehavior: TestModeBehavior
-  public var localResources: [String: URL]
+  public var localResources: [String: AssetResource]
 }
 ```
 
@@ -73,9 +73,9 @@ public final class SuperwallOptions: NSObject {
       default: ".automatic",
     },
     localResources: {
-      type: "[String: URL]",
+      type: "[String: AssetResource]",
       description:
-        "A dictionary mapping resource IDs to local file URLs. See [`localResources`](/ios/sdk-reference/localResources) for the property schema and the [Local Resources guide](/ios/guides/local-resources) for setup details.",
+        "A dictionary mapping resource IDs to local file URLs or asset catalog images. See [`localResources`](/ios/sdk-reference/localResources) for the property schema and the [Local Resources guide](/ios/guides/local-resources) for setup details.",
       default: "[:]",
     },
   }}
diff --git a/content/docs/ios/sdk-reference/advanced/getPaywall.mdx b/content/docs/ios/sdk-reference/advanced/getPaywall.mdx
index 16f98c71..7de38e54 100644
--- a/content/docs/ios/sdk-reference/advanced/getPaywall.mdx
+++ b/content/docs/ios/sdk-reference/advanced/getPaywall.mdx
@@ -22,7 +22,8 @@ public func getPaywall(
   forPlacement placement: String,
   params: [String: Any]? = nil,
   paywallOverrides: PaywallOverrides? = nil,
-  delegate: PaywallViewControllerDelegate
+  delegate: PaywallViewControllerDelegate,
+  onCustomCallback: ((CustomCallback) async -> CustomCallbackResult)? = nil
 ) async throws -> PaywallViewController
 
 // Completion handler version
@@ -31,6 +32,7 @@ public func getPaywall(
   params: [String: Any]? = nil,
   paywallOverrides: PaywallOverrides? = nil,
   delegate: PaywallViewControllerDelegate,
+  onCustomCallback: ((CustomCallback) async -> CustomCallbackResult)? = nil,
   completion: @escaping (PaywallViewController?, PaywallSkippedReason?, Error?) -> Void
 )
 ```
@@ -58,6 +60,11 @@ public func getPaywall(
       description: "A delegate to handle user interactions with the retrieved PaywallViewController.",
       required: true,
     },
+    onCustomCallback: {
+      type: "((CustomCallback) async -> CustomCallbackResult)?",
+      description: "Optional async handler called when the paywall requests a custom callback. Return a `CustomCallbackResult` to report success or failure back to the paywall. Available in version 4.15.1+.",
+      default: "nil",
+    },
     completion: {
       type: "@escaping (PaywallViewController?, PaywallSkippedReason?, Error?) -> Void",
       description: "Completion block for the callback version.",
@@ -79,7 +86,15 @@ Task {
     let paywallViewController = try await Superwall.shared.getPaywall(
       forPlacement: "premium_feature",
       params: ["source": "settings"],
-      delegate: self
+      delegate: self,
+      onCustomCallback: { callback in
+        switch callback.name {
+        case "validate_email":
+          return .success(data: ["validated": true])
+        default:
+          return .failure()
+        }
+      }
     )
     
     present(paywallViewController, animated: true)
@@ -95,7 +110,10 @@ Using completion handler:
 ```swift
 Superwall.shared.getPaywall(
   forPlacement: "premium_feature",
-  delegate: self
+  delegate: self,
+  onCustomCallback: { callback in
+    .success(data: ["callback": callback.name])
+  }
 ) { paywall, skippedReason, error in
   if let paywall = paywall {
     present(paywall, animated: true)
@@ -105,4 +123,4 @@ Superwall.shared.getPaywall(
     print("Error: \(error)")
   }
 }
-```
\ No newline at end of file
+```
diff --git a/content/docs/ios/sdk-reference/index.mdx b/content/docs/ios/sdk-reference/index.mdx
index 967a39ad..e126270a 100644
--- a/content/docs/ios/sdk-reference/index.mdx
+++ b/content/docs/ios/sdk-reference/index.mdx
@@ -16,6 +16,6 @@ If you have feedback on any of our docs, please leave a rating and message at th
 If you have any issues with the SDK, please [open an issue on GitHub](https://github.com/superwall/superwall-ios/issues).
 
 <SdkLatestVersion
-  version="4.15.0"
+  version="4.15.1"
   repoUrl="https://github.com/superwall/Superwall-iOS"
 />
diff --git a/content/docs/ios/sdk-reference/localResources.mdx b/content/docs/ios/sdk-reference/localResources.mdx
index 160353e0..12fbd969 100644
--- a/content/docs/ios/sdk-reference/localResources.mdx
+++ b/content/docs/ios/sdk-reference/localResources.mdx
@@ -1,20 +1,16 @@
 ---
 title: "localResources"
-description: "Register local file URLs so paywalls can load bundled media by resource ID."
+description: "Register local resources so paywalls can load bundled media by resource ID."
 ---
 
-<Info>
-Available in iOS SDK `4.13.0+`.
-</Info>
-
 ## Purpose
 
-`localResources` maps resource IDs to local file URLs so paywalls can request bundled media with `swlocal://resource-id` instead of downloading them from a remote URL.
+`localResources` maps resource IDs to local resources so paywalls can request bundled media with `swlocal://resource-id` instead of downloading them from a remote URL. Values can be file `URL`s or `UIImage`s from asset catalogs.
 
 ## Signature
 
 ```swift
-public var localResources: [String: URL]
+public var localResources: [String: AssetResource]
 ```
 
 ## Schema
@@ -27,8 +23,8 @@ public var localResources: [String: URL]
       required: true,
     },
     value: {
-      type: "URL",
-      description: "A local file URL from your app bundle or sandbox.",
+      type: "AssetResource",
+      description: "A local file `URL` from your app bundle or sandbox, or a `UIImage` from an asset catalog.",
       required: true,
     },
   }}
diff --git a/content/shared/local-resources.mdx b/content/shared/local-resources.mdx
index c1a4b54e..f77908ea 100644
--- a/content/shared/local-resources.mdx
+++ b/content/shared/local-resources.mdx
@@ -28,6 +28,7 @@ On iOS, local resources are configured on `SuperwallOptions.localResources` befo
 let options = SuperwallOptions()
 options.localResources = [
   "hero-image": Bundle.main.url(forResource: "hero", withExtension: "png")!,
+  "logo": UIImage(named: "Logo")!,
   "onboarding-video": Bundle.main.url(forResource: "welcome", withExtension: "mp4")!
 ]