You can't loop through and change them to lower case prior to the report actually reading records.

The issue is, ?Files is a parameter that accepts multiple items, which means it's an array. What I'm not sure of it how to change all selected ?Files in the parameter window a lowercase before the records start being compared to the database. I have LowerCase(table.File_Name) in the select expert and I'm sure that will work, but I'm not sure where to convert my array. It won't work in the parameter window since ?Files is multiple items, maybe a formula run at every different file returned that would assign to a variable and then force that to lowercase? I'm not sure when and how CR increments an array variable so I'm not sure when and where to assign that variable lowercase.

Each one of my files are grouped in my report. What if I create a formula that grabs the lowercase of each parameter file and then compares that with the database? Again my syntax is wrong but I'm thinking something like this:

Shared StringVar array convertedParam;
Local NumberVar i;

For i := 1 To Ubound({?Files}) Do
   (
        Redim convertedParam;
        convertedParam := LowerCase({?Files});
        convertedParam;
      
   );
(my brackets aren't making it through this new post form, is there a code snippet I should be using to escape these characters?)

Currently I'm getting a "true" as a result of this so obviously I'm doing something wrong. But am I on the right track? Then I use the select expert to make sure any table files it pulls is compared with convertedParam instead of the actual ?files param. Obviously I could have to add a counter so i would increment at each new file group.