Customers, downstream employers, and inspectors all ask for the same thing: the current SDS, now. The distribution portal is a shareable page where anyone can search your published sheets and download them — no account, no email chain, no stale attachment.
OSHA HazCom, 29 CFR 1910.1200(g)(6) — manufacturers and distributors must provide the SDS downstream with or before the first shipment, and again when it's updated. A portal your customers can pull from turns that obligation from outbound paperwork into a standing answer.
Put your sheets where the people who need them can pull them — free, from day one.