Forum Discussion
A request for help: SharePoint causing tons of sync problems?
Seeing your NGSC version, I guess that you are also on Windows Insider.
Of course, I cannot say if the issues you are experiencing are actually due to installing Insider builds, but, in general, Insider (aka beta) versions of both Windows and Office should be avoided on production machines.
Also, instead of reusing existing Office documents, you should use Office templates. See for example http://www.techadvisory.org/2014/01/using-office-templates/
Finally, you could disable Autosave completely or only for single files. See https://support.office.com/en-us/article/what-is-autosave-6d6bd723-ebfd-4e40-b5f6-ae6e8088f7a5
Hope it helps...
At this point, I am afraid that your setup is heavily scrambled.
I would suggest contacting Microsoft support.
(Another approach could be rebuilding the machine from scratch, this time using only production builds of everything.)
For solving the immediate problem, have you tried to download locally (e.g. to the desktop) the file from the web UI and send it from there?
The touchscreen on my laptop has been giving me issues to, so opened up a support ticket for that today and they are requesting I send it back. Likely the laptop will be wiped before I get it back, so that will give me a chance to start fresh. But I haven't been focusing on it, but my older Win 7 computer with Office 2010 is a production build, and also has had many of the same issues with SharePoint. I had originally chalked that up to just being Office 2010 and not having full support for the new features, but now I'm not so sure.