Re: Files larger than 150kb not uploading

Windows (cmd with admin rights):

Show MTU
netsh int ipv4 show interfaces
netsh int ipv6 show interfaces

Set MTU
netsh int ipv4 set interface int=xx mtu=yyyy
netsh int ipv6 set interface int=xx mtu=yyyy

Replace xx with the interface number you got from the Show MTU command, and yyyy with the desired MTU.