Pretty surprised to learn that this functionality doesn't exist on the Quote record.

We need the ability to embed third-party apps via iFrame on the Quote record to integrate systems (https://developer.box.com/guides/embed/box-embed/).

For example, we need the same functionality offered by other CRM providers like SalesForce and NetSuite where you can embed Box directly onto a record:

Example 1: https://www.box.com/en-au/partners/salesforce

Example 2: https://www.box.com/en-au/partners/netsuite

The best we can do at the moment is a new button that opens a popup or maybe a canvas which we're currently exploring.