Troubles uploading new images to Amazon S3

Hi there,
I am experiencing severe troubles in uploading new images to Amazon S3 (upload regularly break midway), including some contributed ones.
I had to stop trying for several days as I have been busy, but I will do it again from tonight (GMT+1) on.

In the meantime, we would like you to suggest through our Contact forms other cloud storage providers, if any, that:

  1. Provide multi-user access
  2. Can act as BitTorrent seeding machine for files (to ease our bills)

Thank you.