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Unfortunately, it is not possible to generate the Dropbox file upload links to your email notifications or autoresponders. This is because the links will only be generated once the files are uploaded in Dropbox, also I believe the integration is one way, we can send data to Dropbox but we cannot fetch data from Dropbox.
However, you can have the links of the uploaded files saved in our servers/data centers.
Here's an example:
2. I then filled out my form.
3. I will receive the email notification with the download link for the uploaded file.
I hope that helps.