diff --git a/packages/app-expo/src/components/rag/ExtractorWebView.tsx b/packages/app-expo/src/components/rag/ExtractorWebView.tsx
index 044be0a6..8f04a4a5 100644
--- a/packages/app-expo/src/components/rag/ExtractorWebView.tsx
+++ b/packages/app-expo/src/components/rag/ExtractorWebView.tsx
@@ -6,6 +6,22 @@ import { WebView } from "react-native-webview";
 
 const READER_HTML_ASSET = Asset.fromModule(require("../../../assets/reader/reader.html"));
 
+const EXTRACTOR_EXTENSIONS_BY_MIME: Record<string, string> = {
+  "application/epub+zip": "epub",
+  "application/pdf": "pdf",
+  "application/x-mobipocket-ebook": "mobi",
+  "application/vnd.amazon.ebook": "azw3",
+  "application/vnd.comicbook+zip": "cbz",
+  "application/x-fictionbook+xml": "fb2",
+  "application/x-zip-compressed-fb2": "fbz",
+  "text/plain": "txt",
+};
+
+function getExtractorFileName(mimeType: string) {
+  const normalized = mimeType.split(";")[0]?.trim().toLowerCase() || "application/epub+zip";
+  return `book.${EXTRACTOR_EXTENSIONS_BY_MIME[normalized] || "epub"}`;
+}
+
 export interface ExtractorRef {
   extractChapters: (base64BookData: string, mimeType?: string) => Promise<ChapterData[]>;
 }
@@ -87,8 +103,8 @@ export const ExtractorWebView = forwardRef<ExtractorRef>((_, ref) => {
         const cmd = {
           type: "openBook",
           base64: base64BookData,
-          fileName: "book.epub",
           mimeType,
+          fileName: getExtractorFileName(mimeType),
         };
 
         webViewRef.current.injectJavaScript(`
diff --git a/packages/app-expo/src/screens/library/useVectorizationQueue.ts b/packages/app-expo/src/screens/library/useVectorizationQueue.ts
index 44b97c72..3603dca0 100644
--- a/packages/app-expo/src/screens/library/useVectorizationQueue.ts
+++ b/packages/app-expo/src/screens/library/useVectorizationQueue.ts
@@ -1,17 +1,35 @@
 import type { ExtractorRef } from "@/components/rag/ExtractorWebView";
 import { triggerVectorizeBook } from "@/lib/rag/vectorize-trigger";
+import type { RootStackParamList } from "@/navigation/RootNavigator";
 import { useVectorModelStore } from "@/stores/vector-model-store";
+import type { NativeStackNavigationProp } from "@react-navigation/native-stack";
 import { getPlatformService } from "@readany/core/services";
 import type { Book } from "@readany/core/types";
 import * as FileSystem from "expo-file-system/legacy";
 import { useCallback, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { Alert } from "react-native";
-import type { NativeStackNavigationProp } from "@react-navigation/native-stack";
-import type { RootStackParamList } from "@/navigation/RootNavigator";
 
 type Nav = NativeStackNavigationProp<RootStackParamList>;
 
+const VECTORIZE_MIME_TYPES: Record<string, string> = {
+  epub: "application/epub+zip",
+  pdf: "application/pdf",
+  mobi: "application/x-mobipocket-ebook",
+  azw: "application/vnd.amazon.ebook",
+  azw3: "application/vnd.amazon.ebook",
+  cbz: "application/vnd.comicbook+zip",
+  cbr: "application/vnd.comicbook+zip",
+  fb2: "application/x-fictionbook+xml",
+  fbz: "application/x-zip-compressed-fb2",
+  txt: "text/plain",
+  umd: "application/octet-stream",
+};
+
+function getVectorizeMimeType(book: Book) {
+  return VECTORIZE_MIME_TYPES[String(book.format || "").toLowerCase()] || "application/epub+zip";
+}
+
 interface UseVectorizationQueueOptions {
   extractorRef: React.RefObject<ExtractorRef | null>;
   nav: Nav;
@@ -30,41 +48,50 @@ export function useVectorizationQueue({ extractorRef, nav }: UseVectorizationQue
   } | null>(null);
   const isProcessingRef = useRef(false);
 
-  const processOneBook = useCallback(async (book: Book) => {
-    setVectorizingBookId(book.id);
-    setVectorizingBookTitle(book.meta.title);
-    setVectorProgress({ status: "chunking", processedChunks: 0, totalChunks: 0 });
-
-    try {
-      if (!extractorRef.current) {
-        throw new Error("Extractor WebView not ready");
-      }
-
-      const platform = getPlatformService();
-      const appData = await platform.getAppDataDir();
-      const absPath = await platform.joinPath(appData, book.filePath);
-
-      const base64 = await FileSystem.readAsStringAsync(absPath, {
-        encoding: FileSystem.EncodingType.Base64,
-      });
-
-      const chapters = await extractorRef.current.extractChapters(base64, "application/epub+zip");
-      if (!chapters || chapters.length === 0) {
-        throw new Error("No chapters extracted from book");
+  const processOneBook = useCallback(
+    async (book: Book) => {
+      setVectorizingBookId(book.id);
+      setVectorizingBookTitle(book.meta.title);
+      setVectorProgress({ status: "chunking", processedChunks: 0, totalChunks: 0 });
+
+      try {
+        if (!extractorRef.current) {
+          throw new Error("Extractor WebView not ready");
+        }
+
+        const platform = getPlatformService();
+        const appData = await platform.getAppDataDir();
+        const absPath = await platform.joinPath(appData, book.filePath);
+
+        const base64 = await FileSystem.readAsStringAsync(absPath, {
+          encoding: FileSystem.EncodingType.Base64,
+        });
+
+        const chapters = await extractorRef.current.extractChapters(
+          base64,
+          getVectorizeMimeType(book),
+        );
+        if (!chapters || chapters.length === 0) {
+          throw new Error("No chapters extracted from book");
+        }
+
+        await triggerVectorizeBook(book.id, book.filePath, chapters, (progress) => {
+          setVectorProgress(progress);
+        });
+
+        setVectorProgress({ status: "completed", processedChunks: 1, totalChunks: 1 });
+        await new Promise((resolve) => setTimeout(resolve, 800));
+      } catch (err) {
+        console.error(
+          `[useVectorizationQueue] Vectorization failed for "${book.meta.title}":`,
+          err,
+        );
+        setVectorProgress({ status: "error", processedChunks: 0, totalChunks: 0 });
+        await new Promise((resolve) => setTimeout(resolve, 1500));
       }
-
-      await triggerVectorizeBook(book.id, book.filePath, chapters, (progress) => {
-        setVectorProgress(progress);
-      });
-
-      setVectorProgress({ status: "completed", processedChunks: 1, totalChunks: 1 });
-      await new Promise((resolve) => setTimeout(resolve, 800));
-    } catch (err) {
-      console.error(`[useVectorizationQueue] Vectorization failed for "${book.meta.title}":`, err);
-      setVectorProgress({ status: "error", processedChunks: 0, totalChunks: 0 });
-      await new Promise((resolve) => setTimeout(resolve, 1500));
-    }
-  }, [extractorRef]);
+    },
+    [extractorRef],
+  );
 
   const processQueue = useCallback(async () => {
     if (isProcessingRef.current) return;
@@ -72,8 +99,10 @@ export function useVectorizationQueue({ extractorRef, nav }: UseVectorizationQue
 
     try {
       while (vectorQueueRef.current.length > 0) {
-        const nextBook = vectorQueueRef.current[0]!;
-        vectorQueueRef.current = vectorQueueRef.current.slice(1);
+        const [nextBook, ...remainingBooks] = vectorQueueRef.current;
+        if (!nextBook) break;
+
+        vectorQueueRef.current = remainingBooks;
         setVectorQueue([...vectorQueueRef.current]);
         await processOneBook(nextBook);
       }