Upload : Operation Canelled

I recently reinstalled Nextcloud 11.0.1 on a new server. But I’m having some trouble with uploading files to it…
Everything wen’t flawless while uploading files with the linux client, but then I ad to sync some files from a windows machine and I’m getting the error Operation canceled for a big bunch of files. I’m not really sure what to do here?

Client log : https://hastebin.com/ixawotekok.php
https://hastebin.com/raw/ixawotekok Plain white paper

Server information:
OS - Ubuntu 16.04 LTS

 $sudo -u www-data php occ status
  - installed: true
  - version: 11.0.1.2
  - versionstring: 11.0.1
  - edition:


$apache2 -v
Server version: Apache/2.4.18 (Ubuntu)
Server built:   2016-07-14T12:32:26

 php -v
PHP 7.0.13-0ubuntu0.16.04.1 (cli) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.13-0ubuntu0.16.04.1, Copyright (c) 1999-2016, by Zend Technologies