A shared link opens a preview of the file or folder on dropbox.com, and recipients can view or download the content. Recipients don’t need to have a Dropbox account to view and download your content, but will to comment.
The people you share with will be able to see the latest updates, even after the link is created. A Dropbox link never “breaks,” even if you rename or move a folder or file in your Dropbox.
For added security, you can also set a password, expiration date, and disable downloads for shared links. Disable a shared link at any time. If the recipient of a shared link downloads the file or folder to their local computer and then make changes, it won’t be updated on your Dropbox account.
Sign in to dropbox.com.
Click My Files in the left column.
Hover over the file or folder you’d like to share.
Click Share. (If a link hasn't been created, click Create a link)
Click Link settings to customize who has access or disable downloads. (Dropbox Professional users can also set an expiration date for the link.)
Click Copy link.
The link will be copied to your clipboard. You can then paste it into an email, chat, or any other communication channel
The mobile app
Navigate to the file or folder you want to share.
Tap “…” (ellipsis).
Tap Create a link. If a link was already created for this file or folder, tap Share next to Anyone with the link can view.
Select the way you'd like to share the link from the options.