Which of these are required for Multi-Channel Funnels?
Custom Dimensions
Advertising Features
Goals or Ecommerce
In-page Analytics
Explanation:
The Multi-Channel Funnels reports are generated from conversion paths, the sequences of interactions (i.e., clicks/referrals from channels) during the 90 days1 that led up to each conversion and transaction. Analytics compiles conversion path data for any Goal or Ecommerce transaction you define.
Read more here: https://support.google.com/analytics/answer/1191182