This members-only tutorial provides the steps to display icons that represent the type of files when outputting the values of File-type of custom field that is inside a ACF Pro's Repeater.

Step 1
Install and activate ACF Pro.
Custom Fields → Field Groups → Add New.
Title: Page Fields (in this example, we are going to attach the field group to page
post type, change this accordingly if needed)
Add a Repeater-type of field called "Files" (so the Field Name is files
).
Add a File-type of sub field called "File" (so the Field Name is file
) inside the Repeater.
Leave the Return Value as the default, File Array.
In the Location meta box, select where this field group should be available on.
Step 2
Edit your Page(s) and populate the field group.

Step 3
In the Page/Template that applies to your post type, add this PHP:
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