trying to upload viewable .eps file

I have downloaded this plugin, and it works a charm, but I have a problem that I am trying to resolve:

Is there any way that I can upload a .eps file with a matching .jpg file so that they show as one .eps with an image preview, rather than as two separate files?

I’m trying to create a website selling digital downloads of both photos and .eps files but, to date, I can’t find a way to upload the .eps files and make them viewable to a potential buyer – all I get is a grey box. Stock sites usually request that the matching .eps & .jpg and uploaded together but the result is one, viewable eps image.

https://www.ads-software.com/plugins/add-from-server/