Hi Kuba,
Thanks. I think my problem was more a misunderstanding of the difference between 'add resource' and 'upload collection' . Now I've looked around a bit, I've found it easiest to open a samba share and copy my collections directly to the vol_external_media folder.
As far as trapper-client vs trapper-tools, I'd been trying to get trapper-client to work, but failing each time with library problems. Thanks for the link to the binaries, I'd missed that so I'll give it a try.
Cheers
Richard