We added support to shellbox to access files directly on swift. This was primarily done to improve the performance of video transcoding.

We however never made use of this for PdfHandler, so it seems that here we are still regularly POST'ing 300Mb to 1Gb pdf files instead.
This seems inefficient. It probably makes sense to use direct swift access for pdf/djvu and maybe even for pagedtiffhandler. For this we use:

$sourceFile->getRepo()->addShellboxInputFile()

instead of $cmd->inputFileFromFile()

See also: T292322