Open the note with the PDF or scanned document you want to change.
Click on your Mac.
Open the note with the scanned document you want to change.
Click Show Thumbnails next to the name of the scanned document.
Control-click a thumbnail, then choose Filters.
Click the filter you want (or use the on your Mac.
Select the PDF or scanned document in your note, then choose Edit > Rename Attachment.
Type the new name, then click Save.