diff --git a/assets/l10n/app_en.arb b/assets/l10n/app_en.arb
index 3fc24412fb..fadef524af 100644
--- a/assets/l10n/app_en.arb
+++ b/assets/l10n/app_en.arb
@@ -27,18 +27,22 @@
   "@profileButtonSendDirectMessage": {
     "description": "Label for button in profile screen to navigate to DMs with the shown user."
   },
-  "cameraAccessDeniedTitle": "Permissions needed",
-  "@cameraAccessDeniedTitle": {
-    "description": "Title for dialog when the user needs to grant permissions for camera access."
+  "permissionsNeededTitle": "Permissions needed",
+  "@permissionsNeededTitle": {
+    "description": "Title for dialog when the user needs to grant additional permissions."
   },
-  "cameraAccessDeniedMessage": "To upload an image, please grant Zulip additional permissions in Settings.",
-  "@cameraAccessDeniedMessage": {
-    "description": "Message for dialog when the user needs to grant permissions for camera access."
+  "permissionsNeededOpenSettings": "Open settings",
+  "@permissionsNeededOpenSettings": {
+    "description": "Button label for permissions dialog button that opens the system settings screen."
   },
-  "cameraAccessDeniedButtonText": "Open settings",
-  "@cameraAccessDeniedButtonText": {
+  "permissionsDeniedCameraAccess": "To upload an image, please grant Zulip additional permissions in Settings.",
+  "@permissionsDeniedCameraAccess": {
     "description": "Message for dialog when the user needs to grant permissions for camera access."
   },
+  "permissionsDeniedReadExternalStorage": "To upload files, please grant Zulip additional permissions in Settings.",
+  "@permissionsDeniedReadExternalStorage": {
+    "description": "Message for dialog when the user needs to grant permissions for external storage read access."
+  },
   "actionSheetOptionCopy": "Copy message text",
   "@actionSheetOptionCopy":  {
     "description": "Label for copy message text button on action sheet."
@@ -90,6 +94,10 @@
   "@errorLoginFailedTitle": {
     "description": "Error title for login when signing into a Zulip server fails."
   },
+  "errorMessageNotSent": "Message not sent",
+  "@errorMessageNotSent": {
+    "description": "Error message for compose box when a message could not be sent."
+  },
   "errorLoginCouldNotConnect": "Failed to connect to server:\n{url}",
   "@errorLoginCouldNotConnect": {
     "description": "Error message when the app could not connect to the server.",
@@ -159,6 +167,10 @@
   "@errorDialogContinue": {
     "description": "Button label in error dialogs to acknowledge error."
   },
+  "errorDialogTitle": "Error",
+  "@errorDialogTitle": {
+    "description": "Generic title for error dialog."
+  },
   "lightboxCopyLinkTooltip": "Copy link",
   "@lightboxCopyLinkTooltip": {
     "description": "Tooltip in lightbox for the copy link action."
diff --git a/lib/widgets/compose_box.dart b/lib/widgets/compose_box.dart
index 488b9fdcdb..13ee962adc 100644
--- a/lib/widgets/compose_box.dart
+++ b/lib/widgets/compose_box.dart
@@ -539,6 +539,7 @@ Future<Iterable<_File>> _getFilePickerFiles(BuildContext context, FileType type)
       .pickFiles(allowMultiple: true, withReadStream: true, type: type);
   } catch (e) {
     if (!context.mounted) return [];
+    final zulipLocalizations = ZulipLocalizations.of(context);
     if (e is PlatformException && e.code == 'read_external_storage_denied') {
       // Observed on Android. If Android's error message tells us whether the
       // user has checked "Don't ask again", it seems the library doesn't pass
@@ -546,16 +547,17 @@ Future<Iterable<_File>> _getFilePickerFiles(BuildContext context, FileType type)
       // If the user hasn't checked "Don't ask again", they can always dismiss
       // our prompt and retry, and the permissions request will reappear,
       // letting them grant permissions and complete the upload.
-      showSuggestedActionDialog(context: context, // TODO(i18n)
-        title: 'Permissions needed',
-        message: 'To upload files, please grant Zulip additional permissions in Settings.',
-        actionButtonText: 'Open settings',
+      showSuggestedActionDialog(context: context,
+        title: zulipLocalizations.permissionsNeededTitle,
+        message: zulipLocalizations.permissionsDeniedReadExternalStorage,
+        actionButtonText: zulipLocalizations.permissionsNeededOpenSettings,
         onActionButtonPress: () {
           AppSettings.openAppSettings();
         });
     } else {
-      // TODO(i18n)
-      showErrorDialog(context: context, title: 'Error', message: e.toString());
+      showErrorDialog(context: context,
+        title: zulipLocalizations.errorDialogTitle,
+        message: e.toString());
     }
     return [];
   }
@@ -626,15 +628,16 @@ class _AttachFromCameraButton extends _AttachUploadsButton {
         // use a protected resource. After that, the only way the user can
         // grant it is in Settings.
         showSuggestedActionDialog(context: context,
-          title: zulipLocalizations.cameraAccessDeniedTitle,
-          message: zulipLocalizations.cameraAccessDeniedMessage,
-          actionButtonText: zulipLocalizations.cameraAccessDeniedButtonText,
+          title: zulipLocalizations.permissionsNeededTitle,
+          message: zulipLocalizations.permissionsDeniedCameraAccess,
+          actionButtonText: zulipLocalizations.permissionsNeededOpenSettings,
           onActionButtonPress: () {
             AppSettings.openAppSettings();
           });
       } else {
-        // TODO(i18n)
-        showErrorDialog(context: context, title: 'Error', message: e.toString());
+        showErrorDialog(context: context,
+          title: zulipLocalizations.errorDialogTitle,
+          message: e.toString());
       }
       return [];
     }
@@ -712,7 +715,7 @@ class _SendButtonState extends State<_SendButton> {
       ];
       showErrorDialog(
         context: context,
-        title: 'Message not sent',
+        title: zulipLocalizations.errorMessageNotSent,
         message: validationErrorMessages.join('\n\n'));
       return;
     }