You can share files and folders with someone who doesn’t have a Dropbox account by sending them a view-only shared link. They don’t need to create an account or log in to open the link and preview files.
People who aren’t logged in to a Dropbox account can view shared files and folders, but they can’t edit files or upload files to shared folders.
To edit or upload files to a shared folder, recipients must log in to a Dropbox account and have edit access. Selecting Link for editing doesn’t remove this requirement.
If you want someone to upload files without a Dropbox account, you can create a file request.