Command + I to get file information is the common shortcut on Mac, but it can clutter the screen if we want to view multiple items.
An alternative is to
Show Inspector (
Command+Option+I) that can inspect any file you select which remove the needs to open multiple info windows.
Dropbox keeps the cache of your deleted files in a hidden folder under this path:
If you’re wondering why deleteing files from Dropbox folder on your Mac doesn’t clear up space, consider deleting files inside that hidden folder.