A branch review includes all current revisions of a selected branch as well as all future revisions, that will be attached to the review automatically.
To create a branch review:
Follow the graph on the project home page to locate the branch, then click Review changes and select Create branch review:
Alternatively, go the Branches page by clicking the link:
then select the required branch by clicking on its name enclosed in a blue box, and finally click Create branch review:
Manage the review and participate in it as outlined in Code review with Upsource