diff --git a/src/auto-reply/reply/reply-media-paths.ts b/src/auto-reply/reply/reply-media-paths.ts
index 6c978b1768e..bbfb31a3134 100644
--- a/src/auto-reply/reply/reply-media-paths.ts
+++ b/src/auto-reply/reply/reply-media-paths.ts
@@ -6,6 +6,7 @@ import { assertMediaNotDataUrl, resolveSandboxedMediaSource } from "../../agents
 import { ensureSandboxWorkspaceForSession } from "../../agents/sandbox.js";
 import type { OpenClawConfig } from "../../config/types.openclaw.js";
 import { logVerbose } from "../../globals.js";
+import { resolveChannelAccountMediaMaxMb } from "../../media/configured-max-bytes.js";
 import { isPassThroughRemoteMediaSource } from "../../media/media-source-url.js";
 import { resolveOutboundAttachmentFromUrl } from "../../media/outbound-attachment.js";
 import { resolveAgentScopedOutboundMediaAccess } from "../../media/read-capability.js";
@@ -52,28 +53,8 @@ function resolveReplyMediaMaxBytes(params: {
   channel?: string;
   accountId?: string;
 }): number {
-  const channelId = params.channel?.trim();
-  const accountId = params.accountId?.trim();
-  const channelCfg = channelId ? params.cfg.channels?.[channelId] : undefined;
-  const channelObj =
-    channelCfg && typeof channelCfg === "object"
-      ? (channelCfg as Record<string, unknown>)
-      : undefined;
-  const channelMediaMax =
-    typeof channelObj?.mediaMaxMb === "number" ? channelObj.mediaMaxMb : undefined;
-  const accountsObj =
-    channelObj?.accounts && typeof channelObj.accounts === "object"
-      ? (channelObj.accounts as Record<string, unknown>)
-      : undefined;
-  const accountCfg = accountId && accountsObj ? accountsObj[accountId] : undefined;
-  const accountMediaMax =
-    accountCfg && typeof accountCfg === "object"
-      ? (accountCfg as Record<string, unknown>).mediaMaxMb
-      : undefined;
   const limitMb =
-    (typeof accountMediaMax === "number" ? accountMediaMax : undefined) ??
-    channelMediaMax ??
-    params.cfg.agents?.defaults?.mediaMaxMb;
+    resolveChannelAccountMediaMaxMb(params) ?? params.cfg.agents?.defaults?.mediaMaxMb;
   return typeof limitMb === "number" && Number.isFinite(limitMb) && limitMb > 0
     ? Math.floor(limitMb * 1024 * 1024)
     : MEDIA_MAX_BYTES;
diff --git a/src/infra/outbound/message-action-params.ts b/src/infra/outbound/message-action-params.ts
index 83027ccccdb..5f61570ee6c 100644
--- a/src/infra/outbound/message-action-params.ts
+++ b/src/infra/outbound/message-action-params.ts
@@ -5,6 +5,7 @@ import type { ChannelId, ChannelMessageActionName } from "../../channels/plugins
 import type { OpenClawConfig } from "../../config/types.openclaw.js";
 import { createRootScopedReadFile } from "../../infra/fs-safe.js";
 import { basenameFromMediaSource } from "../../infra/local-file-access.js";
+import { resolveChannelAccountMediaMaxMb } from "../../media/configured-max-bytes.js";
 import {
   buildOutboundMediaLoadOptions,
   resolveOutboundMediaAccess,
@@ -117,28 +118,9 @@ function resolveAttachmentMaxBytes(params: {
   channel: ChannelId;
   accountId?: string | null;
 }): number | undefined {
-  const accountId = typeof params.accountId === "string" ? params.accountId.trim() : "";
-  const channelCfg = params.cfg.channels?.[params.channel];
-  const channelObj =
-    channelCfg && typeof channelCfg === "object"
-      ? (channelCfg as Record<string, unknown>)
-      : undefined;
-  const channelMediaMax =
-    typeof channelObj?.mediaMaxMb === "number" ? channelObj.mediaMaxMb : undefined;
-  const accountsObj =
-    channelObj?.accounts && typeof channelObj.accounts === "object"
-      ? (channelObj.accounts as Record<string, unknown>)
-      : undefined;
-  const accountCfg = accountId && accountsObj ? accountsObj[accountId] : undefined;
-  const accountMediaMax =
-    accountCfg && typeof accountCfg === "object"
-      ? (accountCfg as Record<string, unknown>).mediaMaxMb
-      : undefined;
   // Priority: account-specific > channel-level > global default
   const limitMb =
-    (typeof accountMediaMax === "number" ? accountMediaMax : undefined) ??
-    channelMediaMax ??
-    params.cfg.agents?.defaults?.mediaMaxMb;
+    resolveChannelAccountMediaMaxMb(params) ?? params.cfg.agents?.defaults?.mediaMaxMb;
   return typeof limitMb === "number" ? limitMb * 1024 * 1024 : undefined;
 }
 
diff --git a/src/media/configured-max-bytes.ts b/src/media/configured-max-bytes.ts
index 1418b106c0b..1963e978866 100644
--- a/src/media/configured-max-bytes.ts
+++ b/src/media/configured-max-bytes.ts
@@ -9,3 +9,29 @@ export function resolveConfiguredMediaMaxBytes(cfg?: OpenClawConfig): number | u
   }
   return undefined;
 }
+
+export function resolveChannelAccountMediaMaxMb(params: {
+  cfg: OpenClawConfig;
+  channel?: string | null;
+  accountId?: string | null;
+}): number | undefined {
+  const channelId = params.channel?.trim();
+  const accountId = params.accountId?.trim();
+  const channelCfg = channelId ? params.cfg.channels?.[channelId] : undefined;
+  const channelObj =
+    channelCfg && typeof channelCfg === "object"
+      ? (channelCfg as Record<string, unknown>)
+      : undefined;
+  const channelMediaMax =
+    typeof channelObj?.mediaMaxMb === "number" ? channelObj.mediaMaxMb : undefined;
+  const accountsObj =
+    channelObj?.accounts && typeof channelObj.accounts === "object"
+      ? (channelObj.accounts as Record<string, unknown>)
+      : undefined;
+  const accountCfg = accountId && accountsObj ? accountsObj[accountId] : undefined;
+  const accountMediaMax =
+    accountCfg && typeof accountCfg === "object"
+      ? (accountCfg as Record<string, unknown>).mediaMaxMb
+      : undefined;
+  return (typeof accountMediaMax === "number" ? accountMediaMax : undefined) ?? channelMediaMax;
+}