Doubt with JOINS and GROUP BY in an SQL (Access) query

Question

Thanks for your help. I am not very advanced in SQL and I am facing a difficulty here, is the following:

SELECT tbl_afs_pregao.numaf, 
       tbl_items_pregao.nomeitem, 
       Sum(tbl_items_af.qtd) AS SomaDeQtd, 
       tbl_items_pregao.id_itempregao 
FROM   (tbl_afs_pregao 
        INNER JOIN tbl_items_af 
                ON tbl_afs_pregao.id_af = tbl_items_af.id_af) 
       INNER JOIN tbl_items_pregao 
               ON tbl_items_af.id_itempregao = tbl_items_pregao.id_itempregao 
GROUP  BY tbl_afs_pregao.numaf, 
          tbl_items_pregao.nomeitem, 
          tbl_items_pregao.id_itempregao; 

The result is this:

The point is that I wanted to group the results of those items, SUNPATIENS by the sum of the quantity, but not getting it (1 hour almost trying and already gave rs).

I thank you all,

Hug