What do you still check manually before a risky Shopify import?

I’m curious how other merchants and agencies handle the last review before importing a product or customer CSV, updating a theme, or moving store data.

What are the two or three things you always check by hand, even if you already use a spreadsheet or an import app? And which mistake is hardest to spot until after the import?

I’m building a small set of local preflight reports and trying to keep them focused on real go/no-go decisions instead of producing a giant generic checklist. Right now I’m especially unsure whether people care most about changed or blank fields, duplicate or ambiguous matches, variant structure, cross-file consistency, or theme settings and app blocks.

If you do this work for clients, I’d also love to know what you need to show them before you’re comfortable saying “ready to import.”