diff --git a/mobile/ios-app/App/HermesRepository.swift b/mobile/ios-app/App/HermesRepository.swift
index 1a2192a..5fbe45a 100644
--- a/mobile/ios-app/App/HermesRepository.swift
+++ b/mobile/ios-app/App/HermesRepository.swift
@@ -173,8 +173,9 @@ final class HermesRepository: ObservableObject {
     }
 }
 
-private enum MockHermesData {
+enum MockHermesData {
     static let roundCount = 3
+    private static let fallbackMediaURL = URL(string: "https://devstreaming-cdn.apple.com/videos/streaming/examples/img_bipbop_adv_example_ts/master.m3u8")!
 
     static func session(localeCode: String, appVersion: String) -> HermesSessionResponse {
         HermesSessionResponse(
@@ -240,7 +241,7 @@ private enum MockHermesData {
     ) -> HermesRound {
         let lockAt = now.addingTimeInterval(15)
         let settleAt = lockAt.addingTimeInterval(6)
-        let mediaURL = URL(string: "https://devstreaming-cdn.apple.com/videos/streaming/examples/img_bipbop_adv_example_ts/master.m3u8")!
+        let mediaURL = localMediaURL(named: "example-round.mov") ?? fallbackMediaURL
 
         let event = HermesEvent(
             id: UUID(uuidString: eventID) ?? UUID(),
@@ -319,4 +320,20 @@ private enum MockHermesData {
 
         return HermesRound(event: event, media: media, market: market, oddsVersion: oddsVersion, settlement: settlement)
     }
+
+    static func revealMediaURL() -> URL {
+        localMediaURL(named: "example-reveal.mov") ?? fallbackMediaURL
+    }
+
+    private static func localMediaURL(named fileName: String) -> URL? {
+        let sourceFileURL = URL(fileURLWithPath: #filePath)
+        let repoRoot = sourceFileURL
+            .deletingLastPathComponent()
+            .deletingLastPathComponent()
+            .deletingLastPathComponent()
+            .deletingLastPathComponent()
+
+        let candidate = repoRoot.appendingPathComponent(fileName)
+        return FileManager.default.fileExists(atPath: candidate.path) ? candidate : nil
+    }
 }
diff --git a/mobile/ios-app/Features/Round/RoundView.swift b/mobile/ios-app/Features/Round/RoundView.swift
index 1273c2a..08a85da 100644
--- a/mobile/ios-app/Features/Round/RoundView.swift
+++ b/mobile/ios-app/Features/Round/RoundView.swift
@@ -382,7 +382,7 @@ struct RoundView: View {
                     }
 
                     phase = .reveal
-                    playerCoordinator.play(url: round.media.hlsMasterUrl, startTimeMs: round.media.revealStartMs, rate: 1.0)
+                    playerCoordinator.play(url: revealMediaURL(for: round), startTimeMs: round.media.revealStartMs, rate: 1.0)
                     analytics.track("reveal_started", attributes: roundAnalyticsAttributes(round).merging(baseSelectionAttributes(selectedOutcomeID)) { _, new in new })
                 }
             } catch {
@@ -426,6 +426,10 @@ struct RoundView: View {
         round.market.outcomes.sorted(by: { $0.sortOrder < $1.sortOrder })
     }
 
+    private func revealMediaURL(for round: HermesRound) -> URL {
+        repository.currentSession?.deviceModel == "Demo Device" ? MockHermesData.revealMediaURL() : round.media.hlsMasterUrl
+    }
+
     private func promptTitle(for round: HermesRound?) -> String {
         guard let round else {
             return localization.string(for: "common.loading")