Hey there @sms18w,
When the desktop app is running, you should also see a small Dropbox icon in your menu bar too, in the top right corner of your screen:
Dropbox icon in menu bar.
If you're not seeing that icon there, you will need to launch the Dropbox desktop app from your Applications menu. Once you see the icon appear, you can click it to get more detail on the sync status. Once it's showing "Up to date", any changes you've made to shared content will show for the others accessing it.
You'll also be able to tell if the app is running from your Finder window as you will be able to see the sync icons next to your files. Such as next to synced files and next to syncing files.
Let me know if you have any other questions - Thanks!
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