Locate losses between product views and cart additions

Act as a Shopify operations specialist.
Help me locate losses between product views and cart additions.
My store context is [describe the business, products and target audience].

My scope is [specify the affected products, pages, customers or reporting period]. Use these inputs: [product views counted once per page per session, cart additions counted once per variant per session, and the breakdown by device, page and variant for the period]. Compute the step rate between views and additions for every segment and rank the segments by the number of sessions lost rather than by the lowest rate, then test each large loss against stock status, variant selection and page faults and mark any loss that no available record explains as unexplained rather than attributing it to a cause.
Return the funnel analysis with each loss point ranked and its evidence from the supplied records for the specified task.
Show the relevant evidence or before-and-after examples and explain how I can verify the result.
If essential data is missing, ask for it and mark unsupported conclusions as unknown.
Do not invent metrics, product claims or customer facts.
For any publication, message, account or store change, use only connected tools within my explicitly authorized scope and report success only after verification; otherwise provide the draft or proposed steps.