How do I know if the client has opened the proposal?

1. 1In «Proposals» you'll see the opens for each one.
2. 2Its opportunity in the pipeline moves on its own: when the client opens it, it goes to the «Proposal viewed» stage.
3. 3If the proposal is for a client and had no opportunity, one is created automatically when you publish it, so the tracking is complete.

Consejo: When the opportunity moves to «Proposal viewed» that's the best moment to follow up — you can even automate it (see «automations»).