csv plugin with files

I have inherited an Omeka project and my documentation shows that files were previously uploaded into Omeka using the dropbox plugin and then metadata was applied using the omega admin dashboard. I would now like to use the csv import plugin to apply metadata and populate a filename column in the csv file. Can I ftp files into the omega-1.5/files/archive folder and point to this url in the filename column in the csv file? Do I then skip the dropbox piece all together if I do it this way? I noticed that previously added files using the dropbox plugin are renamed in the archive folder, but the original name is preserved in the file element. Where are they? Thanks for your help!

Are you trying to add metadata to records already in Omeka, or add new records?

The CSV import plugin is only able to add records, not update existing ones.

I want to add new records.