How does “Bulk drop and Companies House” work on the Signed Accounts page?

Drop a folder and every file is read, classified — submitted or full accounts, CT600, computation — matched to a company and a year end from its own period end, and filed. Bulk never overwrites: an occupied slot refuses the file and names what is already there, because sixty unread files are not a decision about any one of them. A single upload into a slot you are looking at is a replacement and is allowed. The Companies House pull fills the Submitted slot with the filleted accounts the registry publishes; the full accounts are not public, so those are always uploaded. Where: Signed Accounts (/accounts/signed-accounts).