diff --git a/app.py b/app.py
index 11b64de..a2e8c50 100644
--- a/app.py
+++ b/app.py
@@ -12,7 +12,7 @@ from sqlalchemy.exc import IntegrityError
 from werkzeug.exceptions import BadRequest
 from werkzeug.security import generate_password_hash, check_password_hash
 from werkzeug.utils import secure_filename
-from flask import Flask, render_template, redirect, url_for, request, flash, session, jsonify
+from flask import Flask, abort, render_template, redirect, url_for, request, flash, session, jsonify
 from flask_sqlalchemy import SQLAlchemy
 from flask_bcrypt import Bcrypt
 from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
@@ -636,16 +636,15 @@ async def upload_video():
         description = form.description.data
 
         if video_file and video_thumbnail:
-
             if not allowed_file(video_file.filename, app.config['ALLOWED_VIDEO_EXTENSIONS']):
                 return redirect(url_for('upload_video'))
-            if not check_file_size(video_file, app.config['MAX_VIDEO_SIZE']):
+            if not await check_file_size(video_file, app.config['MAX_VIDEO_SIZE']):
                 return redirect(url_for('upload_video'))
             if not allowed_file(video_thumbnail.filename, app.config['ALLOWED_IMAGE_EXTENSIONS']):
                 return redirect(url_for('upload_video'))
 
-            video_filename = generate_unique_filename(video_file.filename, app.config['UPLOAD_FOLDER']['videos'])
-            thumbnail_filename = generate_unique_filename(video_thumbnail.filename, app.config['UPLOAD_FOLDER']['thumbnails'])
+            video_filename = await generate_unique_filename(video_file.filename, app.config['UPLOAD_FOLDER']['videos'])
+            thumbnail_filename = await generate_unique_filename(video_thumbnail.filename, app.config['UPLOAD_FOLDER']['thumbnails'])
 
             video_path = os.path.join(app.config['UPLOAD_FOLDER']['videos'], video_filename)
             thumbnail_path = os.path.join(app.config['UPLOAD_FOLDER']['thumbnails'], thumbnail_filename)
@@ -1571,4 +1570,4 @@ def buy_item(item_id):
 if __name__ == '__main__':
     with app.app_context():
         db.create_all()
-    app.run(debug=False)
\ No newline at end of file
+    app.run(debug=True)
\ No newline at end of file
diff --git a/templates/video_edit.html b/templates/video_edit.html
index d733cc5..78770dc 100644
--- a/templates/video_edit.html
+++ b/templates/video_edit.html
@@ -22,7 +22,7 @@
                 <label for="video_thumbnail">Обложка видео</label>
                 {{ form.video_thumbnail(class="file-input") }}
                 {% if video.video_thumbnail_file %}
-                    <img src="{{ url_for('static', filename='thumbnails/' + video.video_thumbnail_file) }}" alt="Thumbnail preview" style="display: flex;aligin: center;">
+                    <img src="{{ url_for('static', filename='thumbnails/' + video.video_thumbnail_file) }}" alt="Thumbnail preview" style="display: flex;margin: 0 auto;">
                 {% endif %}
             </div>
 
@@ -42,4 +42,4 @@
         <a href="{{ url_for('view', content_type='video', id=video.id) }}" class="button">Cancel</a>
     </div>
 </body>
-</html>
+</html>
\ No newline at end of file