Skydrain is a portal that forms part of Skynet, a decentralized file-sharing network built on the Sia blockchain. It allows users to upload files, which are then accessible from any portal within the Skynet network. This system provides a distributed method for file storage and sharing.

Files uploaded to Skydrain are 'pinned' by the portal, ensuring they remain accessible across the Skynet network. A file will stay online as long as it is pinned by at least one portal. If all portals unpin a file, it will eventually be removed from the network.

Skydrain offers a decentralized approach to file storage, enhancing redundancy and resilience compared to traditional centralized cloud storage services. Since files are spread across multiple portals in the Skynet network, it reduces the risk of data loss from single-point failures.

Yes, files uploaded to Skydrain are not encrypted or private. Public access is possible, and uploaded content is visible across the Skynet network. Users must avoid uploading sensitive personal data, as all web pages can potentially access each other's cookies and local storage.

Skydrain, part of the Skynet network, offers distinct advantages like easy file sharing across portals and minimal costs via Siacoin transactions. However, unlike some alternatives, Skydrain does not encrypt files, which might limit its suitability for storing sensitive data.

If you wish to maintain privacy regarding your upload history, Skydrain provides an option to 'clear upload history.' This helps prevent potential phishing or unauthorized access to your activity history within the network.