diff --git a/.gitignore b/.gitignore
index d5e87be21a..f76c5c2282 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,3 +40,4 @@ launchSettings.json
 
 # Test development user appdata files
 dev-appdata/
+c-sharp/**/*.BAK
diff --git a/c-sharp/NetworkObjects/UsfmDataProvider.cs b/c-sharp/NetworkObjects/UsfmDataProvider.cs
index 865ec0f612..d1072a64c3 100644
--- a/c-sharp/NetworkObjects/UsfmDataProvider.cs
+++ b/c-sharp/NetworkObjects/UsfmDataProvider.cs
@@ -1,6 +1,7 @@
 using System.Text.Json;
 using System.Text.Json.Nodes;
 using System.Xml;
+using System.Xml.XPath;
 using Paranext.DataProvider.JsonUtils;
 using Paranext.DataProvider.MessageHandlers;
 using Paranext.DataProvider.MessageTransports;
@@ -43,6 +44,7 @@ protected override ResponseToRequest HandleRequest(string functionName, JsonArra
                 "getBookNames" => GetBookNames(),
                 "getChapter" => GetChapter(args[0]!.ToJsonString()),
                 "getChapterUsx" => GetChapterUsx(args[0]!.ToJsonString()),
+                "setChapterUsx" => SetChapterUsx(args[0]!.ToJsonString(), args[1]!.ToString()),
                 "getVerse" => GetVerse(args[0]!.ToJsonString()),
                 _ => ResponseToRequest.Failed($"Unexpected function: {functionName}")
             };
@@ -73,6 +75,13 @@ private ResponseToRequest GetChapterUsx(string args)
             : ResponseToRequest.Failed(errorMsg);
     }
 
+    private ResponseToRequest SetChapterUsx(string argVref, string argNewUsx)
+    {
+        return VerseRefConverter.TryCreateVerseRef(argVref, out var verseRef, out string errorMsg)
+            ? SetUsx(verseRef, argNewUsx)
+            : ResponseToRequest.Failed(errorMsg);
+    }
+
     private ResponseToRequest GetVerse(string args)
     {
         return VerseRefConverter.TryCreateVerseRef(args, out var verseRef, out string errorMsg)
@@ -87,6 +96,34 @@ public string GetUsx(VerseRef vref)
         return contents;
     }
 
+    public ResponseToRequest SetUsx(VerseRef vref, string newUsx)
+    {
+        try
+        {
+            XmlDocument doc = new() { PreserveWhitespace = true };
+            doc.LoadXml(newUsx);
+            if (doc.FirstChild?.Name != "usx")
+                return ResponseToRequest.Failed("Invalid USX");
+
+            UsxFragmenter.FindFragments(
+                _scrText!.ScrStylesheet(vref.BookNum),
+                doc.CreateNavigator(),
+                XPathExpression.Compile("*[false()]"),
+                out string usfm
+            );
+
+            usfm = UsfmToken.NormalizeUsfm(_scrText, vref.BookNum, usfm);
+            _scrText.PutText(vref.BookNum, vref.ChapterNum, false, usfm, null);
+            SendDataUpdateEvent("*");
+        }
+        catch (Exception e)
+        {
+            return ResponseToRequest.Failed(e.Message);
+        }
+
+        return ResponseToRequest.Succeeded();
+    }
+
     private XmlDocument GetUsxForChapter(int bookNum, int chapterNum)
     {
         return ConvertUsfmToUsx(GetUsfmForChapter(bookNum, chapterNum), bookNum);
diff --git a/c-sharp/ParatextUtils/ParatextGlobals.cs b/c-sharp/ParatextUtils/ParatextGlobals.cs
index 1a93744631..240cba4342 100644
--- a/c-sharp/ParatextUtils/ParatextGlobals.cs
+++ b/c-sharp/ParatextUtils/ParatextGlobals.cs
@@ -34,6 +34,7 @@ public static void Initialize(string dataFolderPath)
                 ICUDllLocator.Initialize(false, false);
 
                 // Now tell Paratext.Data to use the specified folder
+                dataFolderPath = Path.GetFullPath(dataFolderPath); // Make sure path is rooted
                 ParatextData.Initialize(dataFolderPath, false);
                 s_initialized = true;
             }
diff --git a/extensions/src/resource-viewer/resource-viewer.web-view.tsx b/extensions/src/resource-viewer/resource-viewer.web-view.tsx
index 38a2b93d1e..897cdd7cba 100644
--- a/extensions/src/resource-viewer/resource-viewer.web-view.tsx
+++ b/extensions/src/resource-viewer/resource-viewer.web-view.tsx
@@ -123,6 +123,7 @@ const usxEditorCharMap = Object.fromEntries(
 
 interface ScriptureTextPanelUsxProps {
   usx: string;
+  onChanged?: (newUsx: string) => void;
 }
 
 const defaultScrRef: ScriptureReference = {
@@ -135,7 +136,7 @@ const defaultScrRef: ScriptureReference = {
  * Scripture text panel that displays a read only version of a usx editor that displays the current
  * chapter
  */
-function ScriptureTextPanelUsxEditor({ usx }: ScriptureTextPanelUsxProps) {
+function ScriptureTextPanelUsxEditor({ usx, onChanged }: ScriptureTextPanelUsxProps) {
   return (
     // eslint-disable-next-line jsx-a11y/no-static-element-interactions
     <div className="text-panel">
@@ -143,8 +144,9 @@ function ScriptureTextPanelUsxEditor({ usx }: ScriptureTextPanelUsxProps) {
         usx={usx}
         paraMap={usxEditorParaMap}
         charMap={usxEditorCharMap}
-        onUsxChanged={() => {
-          /* Read only */
+        onUsxChanged={(newUsx) => {
+          // TODO: Check if the project is editable
+          if (onChanged) onChanged(newUsx);
         }}
       />
     </div>
@@ -155,11 +157,19 @@ globalThis.webViewComponent = function ResourceViewer(): JSX.Element {
   logger.info('Preparing to display the Resource Viewer');
 
   const [scrRef] = useSetting('platform.verseRef', defaultScrRef);
-  const [usx, , isLoading] = useData.ChapterUsx<UsfmProviderDataTypes, 'ChapterUsx'>(
+  const [usx, setUsx, isLoading] = useData.ChapterUsx<UsfmProviderDataTypes, 'ChapterUsx'>(
     'usfm',
     useMemo(() => new VerseRef(scrRef.bookNum, scrRef.chapterNum, scrRef.verseNum), [scrRef]),
     'Loading Scripture...',
   );
 
-  return <div>{isLoading ? 'Loading' : <ScriptureTextPanelUsxEditor usx={usx ?? '<usx/>'} />}</div>;
+  return (
+    <div>
+      {isLoading ? (
+        'Loading'
+      ) : (
+        <ScriptureTextPanelUsxEditor usx={usx ?? '<usx/>'} onChanged={setUsx} />
+      )}
+    </div>
+  );
 };
diff --git a/extensions/src/usfm-data-provider/index.d.ts b/extensions/src/usfm-data-provider/index.d.ts
index bcac0d81a0..6c8f0a85b0 100644
--- a/extensions/src/usfm-data-provider/index.d.ts
+++ b/extensions/src/usfm-data-provider/index.d.ts
@@ -15,7 +15,7 @@ declare module 'usfm-data-provider' {
   export type UsfmProviderDataTypes = {
     BookNames: DataProviderDataType<boolean, string[], never>;
     Chapter: DataProviderDataType<VerseRef, string | undefined, never>;
-    ChapterUsx: DataProviderDataType<VerseRef, string | undefined, never>;
+    ChapterUsx: DataProviderDataType<VerseRef, string | undefined, string>;
     Verse: DataProviderDataType<VerseRef, string | undefined, never>;
   };