I actually did that but this is not what I need as I am in Real Estate and would like to see pictures in my CRM in an easy way and theses show as attachments 

I am using Studio as I do not have knowledge about coding... is there a simple solution to add multiple pictures without adding codes

Add a many2many field relating to ir.attachments.Check sent by email button in invoice. It opens a wizard which we can add many attachments and also email body

for example, add a many2many field relating to ir.attachement and in xml line of the field, specify widget="many2many_binary"