diff --git a/journal/exporters/doufen.py b/journal/exporters/doufen.py
index d859a611..c4017adb 100644
--- a/journal/exporters/doufen.py
+++ b/journal/exporters/doufen.py
@@ -33,7 +33,7 @@ def export_marks_task(user):
     user.preference.export_status["marks_pending"] = True
     user.preference.save(update_fields=["export_status"])
     filename = GenerateDateUUIDMediaFilePath(
-        None, "f.xlsx", settings.MEDIA_ROOT + settings.EXPORT_FILE_PATH_ROOT
+        None, "f.xlsx", settings.MEDIA_ROOT + "/" + settings.EXPORT_FILE_PATH_ROOT
     )
     if not os.path.exists(os.path.dirname(filename)):
         os.makedirs(os.path.dirname(filename))
@@ -266,7 +266,11 @@ def export_marks_task(user):
     ]:
         ws = wb.create_sheet(title=label)
         q = q_item_in_category(category)
-        reviews = Review.objects.filter(owner=user).filter(q).order_by("created_time")
+        reviews = (
+            Review.objects.filter(owner=user.identity)
+            .filter(q)
+            .order_by("created_time")
+        )
         ws.append(review_heading)
         for review in reviews:
             title = review.title
diff --git a/journal/importers/douban.py b/journal/importers/douban.py
index 2ce456d0..9c7a9d60 100644
--- a/journal/importers/douban.py
+++ b/journal/importers/douban.py
@@ -31,7 +31,7 @@ def _fetch_remote_image(url):
         f = GenerateDateUUIDMediaFilePath(
             None, f"x.{ext}", settings.MARKDOWNX_MEDIA_PATH
         )
-        file = settings.MEDIA_ROOT + f
+        file = settings.MEDIA_ROOT + "/" + f
         local_url = settings.MEDIA_URL + f
         os.makedirs(os.path.dirname(file), exist_ok=True)
         with open(file, "wb") as binary_file:
@@ -93,8 +93,12 @@ def import_from_file(self, uploaded_file):
                 uploaded_file, read_only=True, data_only=True, keep_links=False
             )
             wb.close()
-            file = settings.MEDIA_ROOT + GenerateDateUUIDMediaFilePath(
-                None, "x.xlsx", settings.SYNC_FILE_PATH_ROOT
+            file = (
+                settings.MEDIA_ROOT
+                + "/"
+                + GenerateDateUUIDMediaFilePath(
+                    None, "x.xlsx", settings.SYNC_FILE_PATH_ROOT
+                )
             )
             os.makedirs(os.path.dirname(file), exist_ok=True)
             with open(file, "wb") as destination:
@@ -106,7 +110,8 @@ def import_from_file(self, uploaded_file):
             django_rq.get_queue("import").enqueue(
                 self.import_from_file_task, job_id=jid
             )
-        except Exception:
+        except Exception as e:
+            logger.error(e)
             return False
         return True
 
@@ -248,7 +253,7 @@ def import_mark(self, url, shelf_type, comment, rating_grade, tags, time):
         if not item:
             logger.warning(f"{self.user} | match/fetch {url} failed")
             return
-        mark = Mark(self.user, item)
+        mark = Mark(self.user.identity, item)
         if self.mode == 0 and (
             mark.shelf_type == shelf_type
             or mark.shelf_type == ShelfType.COMPLETE
@@ -264,7 +269,7 @@ def import_mark(self, url, shelf_type, comment, rating_grade, tags, time):
         )
         print("+", end="", flush=True)
         if tags:
-            TagManager.tag_item(item, self.user, tags)
+            TagManager.tag_item(item, self.user.identity, tags)
         return 1
 
     def import_review_sheet(self, worksheet, sheet_name):
@@ -353,7 +358,7 @@ def import_review(self, entity_title, rating, title, review_url, content, time):
             return
         if (
             self.mode == 1
-            and Review.objects.filter(owner=self.user, item=item).exists()
+            and Review.objects.filter(owner=self.user.identity, item=item).exists()
         ):
             return 2
         content = re.sub(
@@ -374,5 +379,7 @@ def import_review(self, entity_title, rating, title, review_url, content, time):
             "body": content,
             "visibility": self.visibility,
         }
-        Review.objects.update_or_create(owner=self.user, item=item, defaults=params)
+        Review.objects.update_or_create(
+            owner=self.user.identity, item=item, defaults=params
+        )
         return 1
diff --git a/journal/importers/goodreads.py b/journal/importers/goodreads.py
index 98fc7fcf..74a352b5 100644
--- a/journal/importers/goodreads.py
+++ b/journal/importers/goodreads.py
@@ -59,7 +59,7 @@ def import_from_url_task(cls, url, user):
                         + "\n\nImported from [Goodreads]("
                         + url
                         + ")",
-                        owner=user,
+                        owner=user.identity,
                     )
                     for book in shelf["books"]:
                         collection.append_item(book["book"], note=book["review"])
@@ -77,7 +77,7 @@ def import_from_url_task(cls, url, user):
                     shelf_url = shelves.get(shelf_type)
                     shelf = cls.parse_shelf(shelf_url, user)
                     for book in shelf["books"]:
-                        mark = Mark(user, book["book"])
+                        mark = Mark(user.identity, book["book"])
                         if (
                             (
                                 mark.shelf_type == shelf_type
diff --git a/journal/importers/opml.py b/journal/importers/opml.py
index fbc09689..a2bf393e 100644
--- a/journal/importers/opml.py
+++ b/journal/importers/opml.py
@@ -33,7 +33,7 @@ def import_from_file_task(self, feeds):
         with set_actor(self.user):
             if self.mode == 1:
                 collection = Collection.objects.create(
-                    owner=self.user, title=f"{self.user.display_name}的播客订阅列表"
+                    owner=self.user.identity, title=f"{self.user.display_name}的播客订阅列表"
                 )
             for feed in feeds:
                 logger.info(f"{self.user} import {feed.url}")
@@ -43,7 +43,7 @@ def import_from_file_task(self, feeds):
                     continue
                 item = res.item
                 if self.mode == 0:
-                    mark = Mark(self.user, item)
+                    mark = Mark(self.user.identity, item)
                     if mark.shelfmember:
                         logger.info(f"{self.user} marked, skip {feed.url}")
                         skip += 1
diff --git a/users/data.py b/users/data.py
index c6bcdd3e..f94640f8 100644
--- a/users/data.py
+++ b/users/data.py
@@ -86,10 +86,9 @@ def export_reviews(request):
 @login_required
 def export_marks(request):
     if request.method == "POST":
-        if not request.user.preference.export_status.get("marks_pending"):
-            django_rq.get_queue("export").enqueue(export_marks_task, request.user)
-            request.user.preference.export_status["marks_pending"] = True
-            request.user.preference.save()
+        django_rq.get_queue("export").enqueue(export_marks_task, request.user)
+        request.user.preference.export_status["marks_pending"] = True
+        request.user.preference.save()
         messages.add_message(request, messages.INFO, _("导出已开始。"))
         return redirect(reverse("users:data"))
     else:
diff --git a/users/models/preference.py b/users/models/preference.py
index 691d0220..3b9e2c86 100644
--- a/users/models/preference.py
+++ b/users/models/preference.py
@@ -17,7 +17,6 @@
 from django.utils.translation import gettext_lazy as _
 from loguru import logger
 
-from common.utils import GenerateDateUUIDMediaFilePath
 from management.models import Announcement
 from mastodon.api import *
 from takahe.utils import Takahe
diff --git a/users/templates/users/data.html b/users/templates/users/data.html
index 1c6d8e53..7c95d798 100644
--- a/users/templates/users/data.html
+++ b/users/templates/users/data.html
@@ -88,7 +88,7 @@
                        value=""
                        placeholder="例如 https://www.goodreads.com/user/show/12345-janedoe"
                        required>
-                <input type="submit"  value="{% trans '导入' %}" id="uploadBtn" />
+                <input type="submit"  value="{% trans '导入' %}" />
               </div>
               <ul>
                 <li>
@@ -128,7 +128,7 @@
                 <br>
                 选择OPML文件
                 <input type="file" name="file" id="excel" required accept=".opml,.xml">
-                <input type="submit"  value="{% trans '导入' %}" id="uploadBtn" />
+                <input type="submit"  value="{% trans '导入' %}" />
               </div>
             </form>
           </details>
@@ -140,14 +140,8 @@
                   method="post"
                   enctype="multipart/form-data">
               {% csrf_token %}
-              {% if export_status.marks_pending %}
-                <input type="submit"
-                       value="{% trans '正在导出标记、短评和评论' %}"
-                       id="uploadBtn"
-                       disabled />
-              {% else %}
-                <input type="submit"  value="{% trans '导出标记、短评和评论' %}" id="uploadBtn" />
-              {% endif %}
+              <input type="submit"
+                     {% if export_status.marks_pending %} value="{% trans '正在导出标记、短评和评论' %}" onclick="return confirm('短期重复导出可能有无法预期的效果，确定现在导出吗？')" {% else %} value="{% trans '导出标记、短评和评论' %}" {% endif %} />
               {% if export_status.marks_file %}
                 <a href="{% url 'users:export_marks' %}" download>下载 {{ export_status.marks_date }} 的导出</a>
               {% endif %}
@@ -159,7 +153,7 @@
             <summary>{% trans '重置所有标记和短评可见性' %}</summary>
             <form action="{% url 'users:reset_visibility' %}" method="post">
               {% csrf_token %}
-              <input type="submit"  value="{% trans '重置' %}" id="uploadBtn" />
+              <input type="submit"  value="{% trans '重置' %}" />
               <div>
                 <input type="radio" name="visibility" id="visPublic" value="0" checked>
                 <label for="visPublic">{% trans '公开' %}</label>