My Dropbox files take up hard drive space from my Mac device.

Thanks for the confirmation, Ashley!

One more thing I'd like you to check, assuming you're currently signed in to your paid account, is if the 'Dropbox system extension' is enabled in your account settings here.

Apologies Hannah, I'm unable to locate the 'Dropbox system extension'.

Oh, you should be able to see it in the 'general' tab of your account settings (the hyperlink I added in my previous reply).

It should be in the 'Preferences' section.

I don't see it.

ashleyjoeann, are you sure you’re currently logged in to your paid Dropbox account on the website? What do you see, if you go to your Plan page here?

I am on Lenovo Dropbox subscription.

But does this have anything to do with free or paid plan? My old account on free plan has no issue at all.

Hi ashleyjoeann, just to check, is the paid plan a Dropbox team plan? 

Are you able to switch between two accounts on your computer, or are you signing out of one account, and then signing into another each time, manually?

No, it's not a team plan. I'll have to sign out manually.

Thanks for the info, could you try reinstalling the Dropbox desktop application, without uninstalling it first by clicking this link?

I've tried twice. Nothing's changed. Maybe the problem is not the application. I used the same application to log in to my old account, and it works fine.