Convenience: uploads path then writes the resulting file object into
the given file/image column of the chosen row.
See also
Other files:
hb_delete_asset(),
hb_download_file(),
hb_upload_file()
Examples
if (FALSE) { # interactive()
client <- hb_client()
hb_attach_file(client, "Samples", "abc", "Report", "report.pdf")
}