diff --git a/apps/readest-app/src/components/metadata/useMetadataEdit.ts b/apps/readest-app/src/components/metadata/useMetadataEdit.ts
index 71bccbad..07a690a6 100644
--- a/apps/readest-app/src/components/metadata/useMetadataEdit.ts
+++ b/apps/readest-app/src/components/metadata/useMetadataEdit.ts
@@ -60,7 +60,7 @@ export const useMetadataEdit = (metadata: BookMetadata | null) => {
     const newMeta = { ...editedMeta } as { [key: string]: unknown };
     switch (field) {
       case 'subject':
-        newMeta['subject'] = value ? value.split(/,|，|、/).map((s) => s.trim()) : [];
+        newMeta['subject'] = value ? value.split(/,|;|，|、/).map((s) => s.trim()) : [];
         break;
       default:
         newMeta[field] = value;
diff --git a/apps/readest-app/src/services/appService.ts b/apps/readest-app/src/services/appService.ts
index 73e77f93..ff81b823 100644
--- a/apps/readest-app/src/services/appService.ts
+++ b/apps/readest-app/src/services/appService.ts
@@ -18,7 +18,7 @@ import {
   getPrimaryLanguage,
 } from '@/utils/book';
 import { partialMD5 } from '@/utils/md5';
-import { BookDoc, DocumentLoader } from '@/libs/document';
+import { BookDoc, DocumentLoader, EXTS } from '@/libs/document';
 import {
   DEFAULT_BOOK_LAYOUT,
   DEFAULT_BOOK_STYLE,
@@ -205,6 +205,7 @@ export abstract class BaseAppService implements AppService {
         hash,
         format,
         title: formatTitle(loadedBook.metadata.title),
+        sourceTitle: formatTitle(loadedBook.metadata.title),
         author: formatAuthors(loadedBook.metadata.author, loadedBook.metadata.language),
         primaryLanguage: getPrimaryLanguage(loadedBook.metadata.language),
         createdAt: existingBook ? existingBook.createdAt : Date.now(),
@@ -215,8 +216,9 @@ export abstract class BaseAppService implements AppService {
       };
       // update book metadata when reimporting the same book
       if (existingBook) {
-        existingBook.title = book.title;
-        existingBook.author = book.author;
+        existingBook.title = existingBook.title ?? book.title;
+        existingBook.sourceTitle = existingBook.sourceTitle ?? book.sourceTitle;
+        existingBook.author = existingBook.author ?? book.author;
         existingBook.primaryLanguage = existingBook.primaryLanguage ?? book.primaryLanguage;
       }
 
@@ -467,7 +469,19 @@ export abstract class BaseAppService implements AppService {
     } else if (book.url) {
       file = await this.fs.openFile(book.url, 'None');
     } else {
-      throw new Error(BOOK_FILE_NOT_FOUND_ERROR);
+      // 0.9.64 has a bug that book.title might be modified but the filename is not updated
+      const bookDir = getDir(book);
+      const files = await this.fs.readDir(getDir(book), 'Books');
+      if (files.length > 0) {
+        const bookFile = files.find((f) => f.path.endsWith(`.${EXTS[book.format]}`));
+        if (bookFile) {
+          file = await this.fs.openFile(`${bookDir}/${bookFile.path}`, 'Books');
+        } else {
+          throw new Error(BOOK_FILE_NOT_FOUND_ERROR);
+        }
+      } else {
+        throw new Error(BOOK_FILE_NOT_FOUND_ERROR);
+      }
     }
     return { book, file, config: await this.loadBookConfig(book, settings) };
   }
diff --git a/apps/readest-app/src/services/webAppService.ts b/apps/readest-app/src/services/webAppService.ts
index 97f50ce4..c393874b 100644
--- a/apps/readest-app/src/services/webAppService.ts
+++ b/apps/readest-app/src/services/webAppService.ts
@@ -151,8 +151,10 @@ const indexedDBFileSystem: FileSystem = {
   async removeDir() {
     // Directories are virtual in IndexedDB; no-op
   },
-  async readDir(path: string) {
+  async readDir(path: string, base: BaseDir) {
+    const { fp } = resolvePath(path, base);
     const db = await openIndexedDB();
+
     return new Promise<{ path: string; isDir: boolean }[]>((resolve, reject) => {
       const transaction = db.transaction('files', 'readonly');
       const store = transaction.objectStore('files');
@@ -162,8 +164,8 @@ const indexedDBFileSystem: FileSystem = {
         const files = request.result as { path: string }[];
         resolve(
           files
-            .filter((file) => file.path.startsWith(path))
-            .map((file) => ({ path: file.path, isDir: false })),
+            .filter((file) => file.path.startsWith(fp))
+            .map((file) => ({ path: file.path.slice(fp.length + 1), isDir: false })),
         );
       };
 
diff --git a/apps/readest-app/src/store/readerStore.ts b/apps/readest-app/src/store/readerStore.ts
index ec126f2e..865d632d 100644
--- a/apps/readest-app/src/store/readerStore.ts
+++ b/apps/readest-app/src/store/readerStore.ts
@@ -16,7 +16,7 @@ import { updateToc } from '@/utils/toc';
 import { useSettingsStore } from './settingsStore';
 import { useBookDataStore } from './bookDataStore';
 import { useLibraryStore } from './libraryStore';
-import { getPrimaryLanguage } from '@/utils/book';
+import { formatTitle, getBaseFilename, getPrimaryLanguage } from '@/utils/book';
 
 interface ViewState {
   /* Unique key for each book view */
@@ -138,8 +138,12 @@ export const useReaderStore = create<ReaderStore>((set, get) => ({
         const { book: bookDoc } = await new DocumentLoader(file).open();
         updateToc(bookDoc, config.viewSettings?.sortedTOC ?? false);
         // Set the book's language for formerly imported books, newly imported books have this field set
-        book.primaryLanguage =
-          book.primaryLanguage ?? getPrimaryLanguage(bookDoc.metadata.language);
+        if (!bookDoc.metadata.title) {
+          bookDoc.metadata.title = getBaseFilename(file.name);
+        }
+        book.sourceTitle = formatTitle(bookDoc.metadata.title);
+        const primaryLanguage = getPrimaryLanguage(bookDoc.metadata.language);
+        book.primaryLanguage = book.primaryLanguage ?? primaryLanguage;
         book.metadata = book.metadata ?? bookDoc.metadata;
         useBookDataStore.setState((state) => ({
           booksData: {
diff --git a/apps/readest-app/src/types/book.ts b/apps/readest-app/src/types/book.ts
index 52273cd8..2d9f56be 100644
--- a/apps/readest-app/src/types/book.ts
+++ b/apps/readest-app/src/types/book.ts
@@ -12,7 +12,8 @@ export interface Book {
   filePath?: string;
   hash: string;
   format: BookFormat;
-  title: string;
+  title: string; // editable title from metadata
+  sourceTitle?: string; // parsed when the book is imported and used to locate the file
   author: string;
   group?: string; // deprecated in favor of groupId and groupName
   groupId?: string;
diff --git a/apps/readest-app/src/types/records.ts b/apps/readest-app/src/types/records.ts
index ddacc14b..9c248c50 100644
--- a/apps/readest-app/src/types/records.ts
+++ b/apps/readest-app/src/types/records.ts
@@ -3,12 +3,14 @@ export interface DBBook {
   book_hash: string;
   format: string;
   title: string;
+  source_title?: string;
   author: string;
   group_id?: string;
   group_name?: string;
   tags?: string[];
   progress?: [number, number];
 
+  metadata?: string | null;
   created_at?: string;
   updated_at?: string;
   deleted_at?: string | null;
diff --git a/apps/readest-app/src/utils/book.ts b/apps/readest-app/src/utils/book.ts
index 9ab55194..a684127b 100644
--- a/apps/readest-app/src/utils/book.ts
+++ b/apps/readest-app/src/utils/book.ts
@@ -14,7 +14,7 @@ export const getLibraryFilename = () => {
 export const getRemoteBookFilename = (book: Book) => {
   // S3 storage: https://docs.aws.amazon.com/zh_cn/AmazonS3/latest/userguide/object-keys.html
   if (getStorageType() === 'r2') {
-    return `${book.hash}/${makeSafeFilename(book.title)}.${EXTS[book.format]}`;
+    return `${book.hash}/${makeSafeFilename(book.sourceTitle || book.title)}.${EXTS[book.format]}`;
   } else if (getStorageType() === 's3') {
     return `${book.hash}/${book.hash}.${EXTS[book.format]}`;
   } else {
@@ -22,7 +22,7 @@ export const getRemoteBookFilename = (book: Book) => {
   }
 };
 export const getLocalBookFilename = (book: Book) => {
-  return `${book.hash}/${makeSafeFilename(book.title)}.${EXTS[book.format]}`;
+  return `${book.hash}/${makeSafeFilename(book.sourceTitle || book.title)}.${EXTS[book.format]}`;
 };
 export const getCoverFilename = (book: Book) => {
   return `${book.hash}/cover.png`;
diff --git a/apps/readest-app/src/utils/transform.ts b/apps/readest-app/src/utils/transform.ts
index d0e1f639..7c525aa8 100644
--- a/apps/readest-app/src/utils/transform.ts
+++ b/apps/readest-app/src/utils/transform.ts
@@ -41,11 +41,13 @@ export const transformBookToDB = (book: unknown, userId: string): DBBook => {
     hash,
     format,
     title,
+    sourceTitle,
     author,
     groupId,
     groupName,
     tags,
     progress,
+    metadata,
     createdAt,
     updatedAt,
     deletedAt,
@@ -62,6 +64,8 @@ export const transformBookToDB = (book: unknown, userId: string): DBBook => {
     group_name: groupName,
     tags: tags,
     progress: progress,
+    source_title: sourceTitle,
+    metadata: metadata ? JSON.stringify(metadata) : null,
     created_at: new Date(createdAt ?? Date.now()).toISOString(),
     updated_at: new Date(updatedAt ?? Date.now()).toISOString(),
     deleted_at: deletedAt ? new Date(deletedAt).toISOString() : null,
@@ -79,6 +83,8 @@ export const transformBookFromDB = (dbBook: DBBook): Book => {
     group_name,
     tags,
     progress,
+    source_title,
+    metadata,
     created_at,
     updated_at,
     deleted_at,
@@ -94,6 +100,8 @@ export const transformBookFromDB = (dbBook: DBBook): Book => {
     groupName: group_name,
     tags: tags,
     progress: progress,
+    sourceTitle: source_title,
+    metadata: metadata ? JSON.parse(metadata) : null,
     createdAt: new Date(created_at!).getTime(),
     updatedAt: new Date(updated_at!).getTime(),
     deletedAt: deleted_at ? new Date(deleted_at).getTime() : null,