Hi there!
I'm implementing Amplitude through GTM. I've disabled the autocapture of pageviews from the init tag as I would like to have control over exactly which parameters I’m sending to Amplitude. However, in the init tag, I see a checkbox for 'Track marketing attribution'.

1/ If I create a pageview as a custom event and leave 'Track marketing attribution' checked, is there anything that should be included in the custom pageview event regarding UTMs or similar parameters?

2/ What is the consequence of unchecking 'Track marketing attribution'? I assume it means it won't track any UTMs or assign the source of traffic based on URL parameters like fbclid, etc. If I want to set this up manually, how should it be done?

Thank you!