How to display the attachments stored in a folder in interface.

Here's an example interface that assumes you're starting with a folder / folder ID containing documents, and displays each one as a consecutive link in a single Rich Text Display Field - this can be rearranged in any number of different ways depending on your particular need.

a!localVariables(
  
  local!documents: getdocumentsfromfolder(
    rootFolder: ri!folder,
    recursiveSearch: false()
  ),
  
  a!boxLayout(
    label: "Documents",
    contents: {
      a!richTextDisplayField(
        value: {
          a!forEach(
            local!documents,
            {
              a!richTextItem(
                text: {
                  a!richTextIcon(icon: "file-o"),
                  " ",
                  document(fv!item, "name"),
                  ".",
                  document(fv!item, "extension")
                },
                link: a!documentDownloadLink(
                  document: fv!item
                )
              ),
              char(10)
            }
          )
        }
      )
    }
  )
)

result: