Transferring attachments from Desktop to Online

Hi,

We are thinking of converting from Desktop to Online and have noted that the attachments can't be converted.

Has anyone come up with a work around for this as we don't have the paper copies now? I've seen where the files are saved but they are all in individual folders that are titled with a random series of letters and numbers so it's not like we can say what they are without going into each folder. Is there anywhere on Desktop this folder info is stored that we could export to create a mapping of what is where?

Thanks