Categorise Attachments

Categorise Attachments

We take ID, proof of address, right to work documentation and more.  I can upload a single file in to field, but we often receive multiple files for each category e.g. someone may send a separate file for the front and back of their national ID card.  My team don't have time to manipulate the files in order to upload them as a single file.

The options, as far as I can tell, would be to create additional fields on attachments in order to categorise what the file is, or to be able to upload single files in to a subform... neither of which seem to be available.

Is there any other way I can do this?  

Thanks

Matt