The dropdown context menu (right-click on Mac) isn't showing

Does this happen with only this particular folder or are others affected too petermooreworld?

Does it persist after rebooting your computer? 

Okay, Nancy, thank you, that mainly worked.  I *do* have right-click context menus in the dropdown. 
Now the issue remains:  there is STILL no icon to the right of the file name to tell me if a file is online-only vs. available offline  (cloud icon vs. green-circled check mark---in the first screenshot I posted on 5/21 above, you can see those icons in the lower folder, but not in the upper). 

Hey petermooreworld - thanks for taking the time to share your experience and thoughts on this. 

When it comes to the missing syncing icons, could you send me a screenshot of how your files in the Dropbox folder look on your end?

Did you try quitting and relaunching the app or even rebooting your computer? 

Hi Nancy.  Short answer: this looks like it's working, thank you!
Detailed answer and further questions:   I waited a few days til I could devote time to this.  I knew at least I'd have to spend time informing the reinstalled dropbox what folders I'd like to Selective Sync, like it did a few weeks ago when I went through this same process on this M1 desktop and last week when I went through this same process (for a totally different issue) on my MacBookPro.   A few suggestions to help the next person: 
The link you sent to unlink the device from the account was just a link to log out of db, which won't do the trick.  This link worked better:
https://help.dropbox.com/security/device-list-remote-sign-out
And the uninstall link is good, however it suggests to "Click your avatar (profile picture or initials) in the top-right corner" but if you just unlinked your device you will have no avatar, so all you can do is Quit.  Most people will probably figure that out, but I can see someone getting derailed on that. 
Similarly, those links say to *delete* the app and the dropbox folders, when actual Mac parlance is to *Move to Trash*.
And, strangely this time, upon starting the downloading process from db.com, it remembered which folders I wanted to Selective Sync from the other week when I did this!!  Must be b/c I recently did it on this same device?   If that's the difference, it'd be helpful for a user like me to know that.  I would've taken screenshots of my prefs weeks ago when it DIDNT remember this, and NOT have done it this time when it DID remember it. 
But the long and short is, at least I'm able to right-click and see my sync options (whew!)
QUESTIONS:  
There's no icon showing me the cloud or green circled arrow to denote offline or make online-only. Why not? Will those show up over time?
And related, when I pull down my DropBox from the menu bar it says "Your files are up to date" yet it just started syncing this in the last 10 minutes and couldn't possibly be done downloading the nearly 1TB of data I asked it to sync.  And sure enough, all of the files that I know should be available offline say they're Zero Bytes when I click on them in my Finder. That doesn't seem right, does it?

Hey petermooreworld! Hope it’s alright, if I chime in.

Here’s what I’d like you to try next: 

1) Unlink your device from Dropbox (after the computer has been unlinked, try deleting a file from both Dropbox folders and then, check www.dropbox.com to make sure the updates you’ve made haven’t synced online).

2) Ensure that all of your previous updates and files (prior to unlinking the app) are accessible online (if they’re not, please create a copy of your local files on a different location, outside of Dropbox).

3) Uninstall the Dropbox app.

4) Delete both Dropbox folders from your device.

5) Download the Dropbox app again and sync everything anew.

That should fix the issue and your files should be syncing to a single Dropbox folder after that.

The new (relinked one on top of that ^^ screenshot) one is indeed linking on the website and to other devices.  I've been using it daily.  

The new one's path, as can be seen from this screenshot,  is ~/Dropbox:

This is the old path, which has the sync icons:

App says it's up-to-date.   It has the generic "trouble opening files" message but that's been there for months.

That's odd indeed petermooreworld - have you tried  adding a sample file on both locations as a test to see which one is syncing with your account on the website and your other devices as well?

Also, can you have a look at the app's preferences and confirm the exact path of your Dropbox folder under the sync tab?

While we're at it, is the app 'up to date' or still syncing in your menu bar? 
 

I would hope the bottom one is not the active location.  As it says "This is an unlinked dropbox" at the top of that folder.  And the fact that new files updated to the top location are the ones I and others see on other devices. That's what strikes me as weird.  That bottom one should NOT have the syncing icons, the top one SHOULD.

Hey petermooreworld, let me jump in here!

Based on your screenshots it looks like the bottom path is where your active Dropbox folder is located. You can see that it has the relevant syncing icons next to your files.

You can always check your app's preferences to see the current path of your Dropbox folder, and double check where it points.

If you right click on a file/folder on the bottom Dropbox folder, do you see the context menu there? 

What happens when you add a file in there? Does it sync to your account online?

Guess not!   Strange, I was looking for an "insert image"  

Anyway, the top  window is my "relinked" newer db. Less folders visible, but that's how I revised it.  The lower window is the library/Cloud Storage, the "old" version.