Here’s the trick to replacing a file without changing its link. This is true regardless of whether you replace the file in the Finder or use Save As or Export from within an app. Dropbox will appear to sync the file, but since it’s really deleting the old file and replacing it with the new one, the underlying Dropbox link URL will change.

Exported file: If the file is in a distribution format, like PDF, you’ll need to edit the file in its native format, export it, and replace the previous version.

Dropbox syncs the changes and updates the file without changing the link.

Editable document: If the shared file is one you can easily edit, like a text file, word-processing document, or image, you can simply open, modify, and save it.

Now you need to replace the file with a new version, but you want to make sure the Dropbox link URL remains the same to avoid confusion on the part of your collaborators. The scenario is simple: You’ve shared a file in Dropbox and sent its link to a bunch of people. TipBITS: Replace a Shared Dropbox File without Changing Its Link

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How to cancel a dropbox download mac