This is the 2252nd most frequent Portuguese word.
umas
"Umas" is the feminine plural form of "a" (meaning "some" or "a few").
Here, 'umas' is used as an indefinite quantifier suggesting an unspecified number of fruits.
Eu quero comprar umas frutas no mercado.
I want to buy some fruits at the market.
In this case, 'umas' emphasizes the presence of certain ideas without exact determination.
Há umas ideias interessantes nesse livro.
There are some interesting ideas in this book.
Here, 'umas' implies a collection or group of photos discovered.