Using the step-by-step builder it is not possible to upload documents to the proposal. But we suggest a very simple alternative that works very well: upload them to a cloud platform, e.g. Google Drive, and share in a "documents" block the corresponding links.
Step 1
Upload the file and our Drive and mark the public link.
Step 2
We create a block in the itinerary where we centralise all the documents linked to their corresponding links (contract, insurance, cancellation policy, etc.).
Step 3
That's it! We open the preview and the potential client will see it like this