Hello,
Thanks in advance for your help, so I have a data table with the following content on Items:
If(IsEmpty(ComboBox1.SelectedItems); Filter('Attachement digitalisation (test)'; LIN= Dropdown1.Selected.Value); Filter('Attachement digitalisation (test)'; LIN= Dropdown1.Selected.Value; COL= ComboBox1.Selected.Value))
On the table, one of the data card's column (named PDF_column) verifies if the the respective line contains an attachement file, if it does it returns false, if it doesn't, it returns true.

But I don't want to show a legend false or true, instead, I want to open the pdf file and it works with the function On Select : Launch(First(DataTable1.Selected.'Pièces jointes').AbsoluteUri) when you select a file that does contain a pdf file (it launches the pdf correctly). But not all of my lines have pdf files, so I added a "👁" on Text :If(DataTable1.Selected.'Comporte des pièces jointes' <> true; "X"; "👁")
but this only changes when you select one line and it changes all the column's content. So I want it to contain "👁" or "X" according to the line like the false/true). 