You can shorten your link within Dropbox. You can do this by following these steps:
(1) Select the file within your Dropbox folder by highlighting it (not clicking the link). Click an empty space anywhere after the name of your file.
(2) A new menu shown below will appear on top of the "list" of your Dropbox files
(4) "Shorten Link" will be available on the popup box
Hope this helps!
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