diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8868f10..f84da80 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## 2.5.13 - 2026-08-05
+
+### Fixed
+
+- Slide and template save forms now allow larger multipart text fields, so rich region content no longer trips Multer's default field-value limit.
+
 ## 2.5.12 - 2026-08-05
 
 ### Fixed
diff --git a/package.json b/package.json
index b1be75f..06a426d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pulse-signage",
-  "version": "2.5.12",
+  "version": "2.5.13",
   "private": false,
   "description": "Pulse Signage application with MySQL and media storage",
   "repository": {
diff --git a/src/web/lib/media/upload-sync.js b/src/web/lib/media/upload-sync.js
index 2ba27fc..d11773f 100644
--- a/src/web/lib/media/upload-sync.js
+++ b/src/web/lib/media/upload-sync.js
@@ -19,6 +19,7 @@ function createUploadSyncService(options) {
   const notifyPlayerScreens = options && options.notifyPlayerScreens;
   const backgroundTaskQueue = options && options.backgroundTaskQueue;
   const MAX_UPLOAD_BYTES = 1024 * 1024 * 1024;
+  const MAX_FIELD_BYTES = 10 * 1024 * 1024;
   const pendingPlayerUploadSyncs = new Map();
   let pendingPlayerUploadSyncFlushTimer = null;
   let pendingPlayerUploadSyncFlushInFlight = null;
@@ -84,7 +85,8 @@ function createUploadSyncService(options) {
     return multer({
       storage: storage,
       limits: {
-        fileSize: MAX_UPLOAD_BYTES
+        fileSize: MAX_UPLOAD_BYTES,
+        fieldSize: MAX_FIELD_BYTES
       }
     });
   }
diff --git a/test/upload-sync.test.js b/test/upload-sync.test.js
new file mode 100644
index 0000000..de5e063
--- /dev/null
+++ b/test/upload-sync.test.js
@@ -0,0 +1,48 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const os = require('node:os');
+const path = require('node:path');
+const express = require('express');
+
+require('../src/common');
+
+const { createUploadSyncService } = require('../src/web/lib/media');
+
+test('multipart uploads accept large text fields used by slide and template forms', async () => {
+  const uploadDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pulse-signage-upload-'));
+  const uploadSyncService = createUploadSyncService({
+    common: {},
+    playerSnapshotCache: new Map(),
+    notifyPlayerScreens: async () => {}
+  });
+  const upload = uploadSyncService.createUploadMiddleware(uploadDir);
+  const app = express();
+
+  app.post('/upload', upload.any(), function (_req, res) {
+    res.sendStatus(204);
+  });
+
+  app.use(function (error, _req, res, _next) {
+    res.status(error.statusCode || 500).send(String(error && error.message ? error.message : error));
+  });
+
+  const server = app.listen(0);
+
+  try {
+    const address = server.address();
+    const largeValue = 'x'.repeat(1_100_000);
+    const formData = new FormData();
+    formData.set('region_text_6', largeValue);
+
+    const response = await fetch(`http://127.0.0.1:${address.port}/upload`, {
+      method: 'POST',
+      body: formData
+    });
+
+    assert.equal(response.status, 204);
+  } finally {
+    await new Promise((resolve) => server.close(resolve));
+    fs.rmSync(uploadDir, { recursive: true, force: true });
+  }
+});
\ No newline at end of file