Rename Files with Date Prefix

Renames all files in a SharePoint document library — including files in subfolders — to prefix them with their created date in yyMMdd format (e.g., 251203-Status Report.pdf).

Always shows a preview table before making any changes, listing current names, new names, folder paths, and skipped files. Files already prefixed with a 6-digit date are automatically skipped to avoid double-prefixing.