Syncing with attachments

I upgraded to Zotero 2.0 about a month ago and have tried from various computers and several countries to upload my library to the Zotero server. I have several smaller pdf's attached and a few large ones (600+ pages). Most of the time I get the response that there was an "error processing uploaded data". I would like to have a backup copy online (in addition to the backups I have on removable storage). Do I need to remove all these attachments in order to sync with the Zotero server? That would be a very lengthy procedure. Is there any other way to make the sync successful?
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