diff --git a/autoytarchive/cappedio.py b/autoytarchive/cappedio.py
index 24d2321..344e946 100644
--- a/autoytarchive/cappedio.py
+++ b/autoytarchive/cappedio.py
@@ -29,7 +29,7 @@ class CappedBufferedReader(io.BufferedReader):
             elif whence == os.SEEK_SET:
                 current_pos = self.tell()
                 if current_pos > offset:
-                    self.capped_size += current_pos
+                    self.capped_size += current_pos - offset
         return super().seek(offset, whence)
 
     @property
diff --git a/autoytarchive/workers.py b/autoytarchive/workers.py
index bd14e2a..8c1a13c 100644
--- a/autoytarchive/workers.py
+++ b/autoytarchive/workers.py
@@ -224,13 +224,13 @@ async def _upload_worker():
             tempdir = tempdir_obj.name
             base_filename = video_json['id'] + '.mkv'
             video_filename = os.path.join(tempdir, base_filename)
-            total_size = os.path.getsize(video_filename)
-            is_big = total_size > size_limit
             files_sent = size_sent = 0
             messages = []
             file = bopen(video_filename, None)
+            file.seek(0, os.SEEK_END)
+            total_size = file.tell()
+            is_big = total_size > size_limit
             while total_size > 0:
-                file.capped_size = None
                 file.seek(size_sent)
                 file.capped_size = size_limit
                 if is_big:
@@ -238,12 +238,13 @@ async def _upload_worker():
                 else:
                     file.name = base_filename
                 messages.append((await client.send_message(config['config']['storage_chat_id'], f'Uploading {file.name}...', parse_mode=None)).id)
-                message = await client.send_file(config['config']['storage_chat_id'], file, caption=file.name, parse_mode=None)
+                message = await client.send_file(config['config']['storage_chat_id'], file, caption=file.name, parse_mode=None, file_size=size_limit if total_size > size_limit else total_size)
                 total_size -= message.document.size
                 if total_size > 0:
                     size_sent += message.document.size
                     files_sent += 1
-                    file = bopen(video_filename, None)
+                    file.capped_size = None
+            file.close()
             if messages:
                 await client.delete_messages(config['config']['storage_chat_id'], messages)
         finally: