Openvpn "large" files transfer problem

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Windows

Hello all,

In our company we have 2 buildings were we work from, one NAS is our main server.

The NAS is in the building I work from (building 1).

Remote workers (building 2) use OpenVPN to connect to our NAS and get access to it directly.

When remote workers send files under lets say 10Mb +/- all works properly, but when the files to be sent are bigger then the copy operation starts and fails after a while getting cancelled without further notification.

Have you seen this behavior?
Have you solved it?
If so... how?

If you haven't... can you give me any idea of what to try?

As always, thank you in advance.

What I have tried:

Searching the Internet and sending this message.