What are available channels? Can I configure custom channels?
To see your channel, go to Behaviour Report, then scroll down until you see Sessions by Session Source/Medium and click on the drop down box. You will be able to select Default Channel Grouping.
Channels in App+ Web are Organic Search, Direct, Referral, Paid Search, Organic Social and Email.
In terms of custom channels, it doesn’t appear that this is available yet.