Dropbox not syncing - as of about 2 days ago

My dropbox folder on my Windows 10 (v20H2) PC has stopped syncing.

I think perhaps it was because I ran an automated upgrade to the Dropbox software yesterday and perhaps something went wrong - but I am not sure about that.

Regardless, here what I have tried to get it working again, and my current situation:

I tried all the steps here: https://help.dropbox.com/installs-integrations/sync-uploads/files-update-issues

Also, I completely uninstalled Dropbox from my machine and installed it again.  I am signed on correctly and can see all my other dropbox files/folders just fine; they all have a green circle with a checkmark in them; they are also all present as expected.

I reviewed some past community posts, one suggested the use of a tool called ISS Crypto, which I installed and ran, followed by a reboot - but still no love.

What is not happening, but had worked for months and months, is I am creating a Dropbox file thru the use of a service called IFTTT and once that file is created and synced to my PC, a program running on my PC opens it up, processes it, and deletes it.

However, now, while the file is getting created by IFTTT it is not being synced to my PC as it had in the past.

Originally, I thought that the problem might have been with IFTTT, but it is not (see notes below).

Having that said, if I sign on to dropbox.com and navigate to the folder that I expect the file to be created in, and then trigger IFTTT to create the file, I see it being created via the web interface (following a refresh my browser (chrome)) and in that case it is then immediately synced to my computer as it should be.

I checked my syncing options and they seem correct.  Some of the documentation said I could disable selective sync but I don't see that option as one which exists now.   Regardless, the folder and subfolder in which the file is being created are both 'checked' to be synced - and as I mentioned, when I am signed onto the dropbox.com site and refresh my browser it all works fine.  It just does not work without me doing that.

I've spent several hours today trying to work this out, but am at a loss and am now reaching out for support.  Any help would be very much appreciated.

Thank you