A file won't upload

If you receive an error message while uploading a file, please make sure that the file is smaller than 2 GB, which is the maximum size for the web interface. You will need to use the Yandex.Disk app or connect via WebDAV to upload larger files.

If the file is smaller than 2 GB, the issue may be caused by a proxy server or a second firewall (in addition to the default OS firewall). Try temporarily disabling your firewalls and upload the files again.

You might also try disabling your antivirus software to rule out any possibility of it interfering with the app. If that doesn't work, see if using a different browser solves your problem. You can download another browser from browsers.yandex.com.