fix: android file provider paths

app.json

@@ -91,7 +91,8 @@
           }
         }
       ],
-      "expo-status-bar"
+      "expo-status-bar",
+      "./plugins/withFileSystemProviderPaths"
     ],
     "experiments": {
       "typedRoutes": true,

package.json

@@ -135,6 +135,7 @@
     "@babel/generator": "^7.29.7",
     "@babel/preset-typescript": "^7.27.1",
     "@biomejs/biome": "^2.4.15",
+    "@expo/config-plugins": "^57.0.6",
     "@j178/prek": "^0.4.6",
     "@react-native/jest-preset": "0.86.0",
     "@types/jest": "^29.5.14",

plugins/withFileSystemProviderPaths.ts

@@ -0,0 +1,35 @@
+import { withDangerousMod } from '@expo/config-plugins';
+import * as path from 'path';
+import * as fs from 'fs';
+
+const PROVIDER_PATHS_XML = `<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <files-path name="expo_files" path="." />
+    <cache-path name="cached_expo_files" path="." />
+    <external-path name="external" path="." />
+    <external-files-path name="external_files" path="." />
+</paths>
+`;
+
+/**
+ * Ensures android/app/src/main/res/xml/file_system_provider_paths.xml
+ * includes <external-path> and <external-files-path>.
+ *
+ * Without these, @magrinj/expo-quick-look's FileProvider can't serve files from
+ * /storage/emulated/0/Pictures/ (e.g. screenshot previews), because
+ * expo-file-system's version of the same-named resource wins during Android
+ * resource merging and is missing those two entries.
+ */
+export default function withFileSystemProviderPaths(
+  config: import('@expo/config-plugins').ExpoConfig,
+): import('@expo/config-plugins').ExpoConfig {
+  return withDangerousMod(config, [
+    'android',
+    (config) => {
+      const resXmlDir = path.join(config.modRequest.platformProjectRoot, 'app/src/main/res/xml');
+      fs.mkdirSync(resXmlDir, { recursive: true });
+      fs.writeFileSync(path.join(resXmlDir, 'file_system_provider_paths.xml'), PROVIDER_PATHS_XML);
+      return config;
+    },
+  ]);
+}