Sorry JenoP, but I really have to strongly disagree with your solutions.  (Sorry  :)  )

Carol....   I'm not an Intuit/QBs employee, I'm an IT/Network guy.  So I'm not looking at your issue from what can Intuit or it's partners do for you, I'm looking at the solution. 

I'd recommend you look at one of the various Remote Desktop programs out there such as TeamViewer, AnyDesk, Splashtop, GoToMyPC, and multiple others.  If your company has an IT guy you use, discuss this with them too.

For you're situation, I'd recommend TeamViewer (I don't use them, but they're probably the best choice for you).  They allow you to use their program for free for "Personal" use.  It may be a bit of a stretch, but with COVID-19 and your working at home, I'd call it Personal Use.  What TeamViewer (or the others) let you do is basically make it so you're sitting at your desk at home and you're working 100% on your computer at work.  So you can do all your work from home and keep your QBs file up to date on the machine at work.

The nice thing about TeamViewer is that it also lets you make the monitor at the remote machine (work) black.  So while you're working on QBs doing payroll or other things you don't want people to see, they won't see them if they walk into the office.

All of these programs also let you easily copy files.   So the other option would be to load QBs on your home computer and actually do all the work there.  Then whenever you think you need to, copy the file from your home computer to your work computer.  The GREAT thing about this is that you now have an "off-site" backup of your QBs file.  So if there's a fire, theft, etc., you still have a copy of your QBs file. 

I would STRONGLY recommend you stay away from any Cloud, Online Sharing, etc. setups.  I can't tell you how many people have gone down that road and had nothing but problems if they don't have an in-house IT team making sure things are backed up and confirm they're working as they should.  Not to mention having a business agreement in place where the hosting site is responsible if they mess up.  None of these companies going after the small business market are doing that. 

Working remotely is pretty simple these days.  Can't tell you how much of it I've been setting up the last few weeks.....