Hey. you can do it with selective sync.
You can find it if you click dropbox icon and then your avatar picture, then go to preferences and sync tab.
There you can select what to save on your computer.
The only thing is that you will probably have to move those files in one folder.
Selective sync is not working with seperate files.
hope this helps you.
Let me know.
Here is a more detailed link:
https://help.dropbox.com/installs-integrations/sync-uploads/selective-sync-overview