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This portal is part of Skynet, a file sharing network running on top of Sia . Files uploaded to this portal are available to download from any other portal on the Sia network.
Files uploaded to a portal are "pinned" by that portal. As long as a file is pinned it will be accessible through all portals on the network. A portal can choose to unpin a file any time, if a file is not pinned it will eventually be removed from the network. Pinning files costs money for the portal operator, so files can't stay around forever. Uploading a file to multiple portals should help keep it online for a long time as the file will only be lost after the last portal unpins it.