diff --git a/app-server/src/application.js b/app-server/src/application.js
index a2c065f..2d594bf 100644
--- a/app-server/src/application.js
+++ b/app-server/src/application.js
@@ -26,7 +26,7 @@ module.exports = new class Application {
 
   userOptions() {
     if (this._userOptions === null) {
-      this._userOptions = new UserOptions('../../config/config.local.js');
+      this._userOptions = new UserOptions(process.env.NIX_SCANSERVJS_CONFIG_PATH);
     }
     return this._userOptions;
   }
diff --git a/app-server/src/classes/user-options.js b/app-server/src/classes/user-options.js
index f129e3c..c71e754 100644
--- a/app-server/src/classes/user-options.js
+++ b/app-server/src/classes/user-options.js
@@ -4,7 +4,7 @@ const path = require('path');
 module.exports = class UserOptions {
   constructor(localConfigPath) {
     if (localConfigPath) {
-      const localPath = path.join(__dirname, localConfigPath);
+      const localPath = localConfigPath;
       if (fs.existsSync(localPath)) {
         this.local = require(localPath);
       }
diff --git a/app-server/src/express-configurer.js b/app-server/src/express-configurer.js
index 945dae2..1b456cc 100644
--- a/app-server/src/express-configurer.js
+++ b/app-server/src/express-configurer.js
@@ -166,6 +166,7 @@ module.exports = class ExpressConfigurer {
 
     try {
       fs.mkdirSync(config.outputDirectory, { recursive: true });
+      fs.mkdirSync(config.previewDirectory, { recursive: true });
       fs.mkdirSync(config.thumbnailDirectory, { recursive: true });
       fs.mkdirSync(config.tempDirectory, { recursive: true });
     } catch (exception) {
@@ -220,7 +221,7 @@ module.exports = class ExpressConfigurer {
    * @returns {ExpressConfigurer}
    */
   statics() {
-    this.app.use(express.static('client'));
+    this.app.use(express.static('@client@'));
     return this;
   }