function readOnly(count){ }
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In visualforce page we have Apex:relatedList tag which helps you show all related child records.With help of this tag you can able to see attched filed under the record.
1.http://sfdcsrini.blogspot.com/2015/01/how-to-use-apexrelatedlist-tag-in.html#:~:text=in%20Visualforce%20Page%3F-,How%20to%20Use%20Apex%3ArelatedList%20tag%20in%20Visualforce%20Page%3F,lookup%20or%20master%2Ddetail%20relationship.
2.https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_quick_start_custom_mapping.htm
3.https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_dynamic_vf_components_sample.htm
If you are not able to find the solution then create an apex controller to query child object records using record id. then show this data on page
Regards
Vijay