Access to company files from web browser

I need staff to be able to access company documents from a web browser.
I have Server 2012 and a QNAP TS-259 Pro+.
The QNAP is configured for domain security.
I want to share some folders on either the QNAP or the server so that staff can log in using their domain credentials and then gain read-only access to the documents.
I want them to be able to view and/or download the files.
I'm not sure how to go about this.
Do I use FTP, File Manager, Download Manager, Web Server or something else?
Should I use the QNAP or the server?
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Tom BeckCommented:
An SSL VPN appliance would be the ideal solution but it requires the purchase of an additional device if your firewall does not already have that feature. It makes your job much easier. Users just log in from any web browser. You can set privileges per folder, per file even if necessary. Here's a Barracuda model for $700.

The killer thing about Barracuda (and probably other manufacturers) is the annual maintenance agreements. You will also need to purchase an SSL certificate from an authority (regardless of what solution you choose).

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akbAuthor Commented:
Thanks for the suggestion Tom but I am really hoping to do this with the hardware I already have if that is possible.
I was originally planning to share the files using Office 365's OneDrive but soon discovered that there were too many limitations: 20,000 file limit, unintuitive interface, syncing problems during testing, inability to copy a file from a shared folder to a user's private folder, etc.
You could install Sharepoint on server of yours. But make sure the server isn't a DC. As with all other server roles, a DC should never host anything else than DC stuff.
akbAuthor Commented:
Thanks Rindi, but from what I'm reading, Sharepoint has the same limitations as Onedrive.
akbAuthor Commented:
These were not the solutions I was hoping for.
I discovered I could use Download Station in the QNAP but I would have to spend too much time working out how to configure it. Looks like Server 2012 has no built in solution.
I ended up using OneDrive in our Office 365 subscription. It's not a good solution but it will do in the short term.
Thanks for your input.
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