From your Windows laptop you can simply point a vSphere client directly to the ESXi host and login as root (or point your vSphere client to the vCenter server). Next, from "Home > Inventory > Hosts and Clusters" highlight a VMHost in the left pane, and from the Summary Tab in the right pane, identify the storage listed. Right-click the desired datastore and browse it. From here you can click the appropriate icon at the top to upload a file or folder.