• content
• content management
• attribute
  You can use the following code to retrieve attachment attributes:

DATA: lt_ios                TYPE skwf_ios,
           ios_properties_result TYPE crm_kw_propst.
DATA(ls_ios) = VALUE skwf_io( objtype = 'P' class = 'BDS_POC22' objid = '0090FA0D8DC21EE398905A1611087AC8' ).
APPEND ls_ios TO lt_ios.
CALL FUNCTION 'CRM_KW_PROPERTIES_GET'
  EXPORTING
    ios                   = lt_ios
  IMPORTING
    ios_properties_result = ios_properties_result.

for objid just pass the guid of attachment physical instance, not logical instance.
The returned attributes could be classified as two types: the header attribute and the table attribute.

Those attributes could be found tcode DMWB:

The header attribute for product is stored in table BDSPHIO22

the table attribute for product is stored in table BDSPHPR22.