Attaching media as meta fields

Hi Folks

— apologies for cross posting. not sure is this is more of a theme-based question..?

I am using a version of “RichWP Photo 1.0” theme on a site i took over from someone.

It seems like meta fields are added to a page (as in https://www.itzuvit.net/?page_id=554) – which include images onto that page. So a single page, will have multiple entries of the meta field “image_id” which are URLs to images.

I am looking to add more images to these pages – is there any other any to add them in bulk? even the ‘attach’ option via media would be good. as it stands now – it looks like for each image i want to add – it needs to be added one by one as a meta field on the page.

Thanks in advance!