file_advanced within a group is not showing in views

Hi, i can't figure out how to show a file_advanced within a group in views, here is the code i am using without success:

{% for item in post.group_6pcqt1d2ftx.file_advanced_0ww1l16qinym_t6b88pn7pkh %}
{{ item.title }}
{% endfor %}

{% for item in post.file_advanced_0ww1l16qinym_t6b88pn7pkh %}
{{ item.title }}
{% endfor %}

{% for item in post.group_6pcqt1d2ftx(file_advanced_0ww1l16qinym_t6b88pn7pkh) %}
{{ item.title }}
{% endfor %}

the original ID in chrome inspector is:
name= "group_6pcqt1d2ftx[file_advanced_0ww1l16qinym_t6b88pn7pkh]"
id= "file_advanced_0ww1l16qinym_t6b88pn7pkh"

other fields like selects dates and text fields are showing normally, i just put a dot between the group name and field name

simple file upload are working too, like this one:

{% for item in post.file_iozdgw4b4q9 %}

{% endfor %}

thanks in advance