When using GigUpload the contents of each posted file are cached
on disk rather than in memory. You can continue to use the standard
methods you would use for smaller files but you may find it more
efficient to access the uploaded file directly.
This is particularly true for very large uploads. It can take
some time to copy a 1 GB file from one location to another and
often it is more efficient simply to detach the upload cache, move
it to the required location and then rename it.
When you detach a temporary file the path to that file will be
passed back to you. At that point you take responsibility for the
file and you should ensure that it is either moved to an
appropriate location or deleted as appropriate.