If you’re storing materials for job, then who will pay for the theft, damage and/or vandalism of the materials, because you know it happens.
Even the best most detailed plans and specs will have both errors and omissions and GC and owner “on the fly” changes. That’s where being on site really helps.
I really wish you the best of luck @Iglooo I wouldn’t do it without a trusted someone onsite everyday and not just the contractor and/or his foreman.