Check “Create Slipsheets for formats other than PDFs” to automatically insert a labeled placeholder page for any non-PDF file types Final Exhibits 2 can’t stamp directly—such as Excel spreadsheets, cad files, or videos. Each slipsheet displays the default text “File Provided in Native Format”, which you can customize as needed.
To adjust the dimensions of the PDF and the margins,
To edit the elements and text of the slipsheets, click Edit > Edit Slipsheet. Here you can adjust:

Right-click in the text field to reveal available dynamic text variables. You can select the text variable you like from this menu, or directly type, "@file," "@full," etc..."

Dynamix Text Variables
"@file"
Inserts the filename without the extension.
"@full"
Inserts the complete filename, including the extension.
"@ext"
Inserts only the file’s extension (e.g., pdf, jpg, mp4).
"@filePart"
Inserts the custom portion of the filename defined in Filename Options.