diff --git a/app/src/main/java/com/all/pdfreader/pro/app/ui/act/PdfViewActivity.kt b/app/src/main/java/com/all/pdfreader/pro/app/ui/act/PdfViewActivity.kt
index 86b45ea..301cabb 100644
--- a/app/src/main/java/com/all/pdfreader/pro/app/ui/act/PdfViewActivity.kt
+++ b/app/src/main/java/com/all/pdfreader/pro/app/ui/act/PdfViewActivity.kt
@@ -155,7 +155,7 @@ class PdfViewActivity : BaseActivity(), OnLoadCompleteListener, OnPageChangeList
 
         viewModel.fileActionEvent.observeEvent<FileActionEvent.SetPageFling>(this) { event ->
             val file = File(pdfDocument.filePath)
-            loadPdfInternal(file, null)
+            loadPdfInternal(file, currentPassword)
         }
 
         viewModel.fileActionEvent.observeEvent<FileActionEvent.SetColorInversion>(this) { event ->
@@ -340,7 +340,6 @@ class PdfViewActivity : BaseActivity(), OnLoadCompleteListener, OnPageChangeList
     private fun showPasswordDialog(file: File) {
         PdfPasswordProtectionDialogFragment(file, onOkClick = { password ->
             tryLoadPdfWithPassword(file, password)
-            currentPassword = password
         }, onCancelClick = {
             finish()
         }).show(supportFragmentManager, TAG)
@@ -348,6 +347,7 @@ class PdfViewActivity : BaseActivity(), OnLoadCompleteListener, OnPageChangeList
 
     private fun tryLoadPdfWithPassword(file: File, password: String) {
         loadPdfInternal(file, password) // 传入密码
+        currentPassword = password
     }
 
     private fun loadPdfInternal(file: File, password: String?) {
diff --git a/app/src/main/java/com/all/pdfreader/pro/app/util/StoragePermissionHelper.kt b/app/src/main/java/com/all/pdfreader/pro/app/util/StoragePermissionHelper.kt
index 1327b1f..afdcaf3 100644
--- a/app/src/main/java/com/all/pdfreader/pro/app/util/StoragePermissionHelper.kt
+++ b/app/src/main/java/com/all/pdfreader/pro/app/util/StoragePermissionHelper.kt
@@ -27,13 +27,21 @@ object StoragePermissionHelper {
                     Manifest.permission.READ_MEDIA_VIDEO
                 )
             }
+
             Build.VERSION.SDK_INT >= Build.VERSION_CODES.R -> {
                 // Android 11-12
-                arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE)
+                arrayOf(
+                    Manifest.permission.READ_EXTERNAL_STORAGE,
+                    Manifest.permission.WRITE_EXTERNAL_STORAGE
+                )
             }
+
             else -> {
                 // Android 10及以下
-                arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE)
+                arrayOf(
+                    Manifest.permission.READ_EXTERNAL_STORAGE,
+                    Manifest.permission.WRITE_EXTERNAL_STORAGE
+                )
             }
         }
     }
@@ -47,7 +55,10 @@ object StoragePermissionHelper {
             // Android 10及以下检查基本存储权限
             val permissions = getRequiredPermissions()
             permissions.all { permission ->
-                ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED
+                ContextCompat.checkSelfPermission(
+                    context,
+                    permission
+                ) == PackageManager.PERMISSION_GRANTED
             }
         }
     }
diff --git a/app/src/main/java/com/all/pdfreader/pro/app/viewmodel/PdfViewModel.kt b/app/src/main/java/com/all/pdfreader/pro/app/viewmodel/PdfViewModel.kt
index 5928da0..94ab186 100644
--- a/app/src/main/java/com/all/pdfreader/pro/app/viewmodel/PdfViewModel.kt
+++ b/app/src/main/java/com/all/pdfreader/pro/app/viewmodel/PdfViewModel.kt
@@ -44,7 +44,7 @@ class PdfViewModel : ViewModel() {
 
     //触发修改文件名操作
     fun renamePdf(filePath: String, newName: String) {
-        viewModelScope.launch {
+        viewModelScope.launch(Dispatchers.IO) {
             val oldFile = File(filePath)
             val renameResult = FileUtils.renameFile(oldFile, newName)
             Log.d(
@@ -77,7 +77,7 @@ class PdfViewModel : ViewModel() {
     }
 
     fun deleteFile(filePath: String) {
-        viewModelScope.launch {
+        viewModelScope.launch(Dispatchers.IO) {
             val file = File(filePath)
             val deleteResult = FileDeleteUtil.deleteFile(file)
             Log.d("ocean", "deleteFile->file: $file, deleteResult=$deleteResult")
@@ -128,7 +128,7 @@ class PdfViewModel : ViewModel() {
     }
 
     fun duplicateFile(context: Context, filePath: String) {
-        viewModelScope.launch {
+        viewModelScope.launch(Dispatchers.IO) {
             val file = FileUtils.duplicateFile(File(filePath))
             Log.d("ocean", "duplicateFile->$file")
             if (file != null) {