20211027_720pmp4 «EXTENDED SOLUTION»

Because your text contains an underscore ( _ ), the "P" immediately following it is capitalized. Other Formatting Options

If you are looking to convert the filename into "proper case" (where the first letter of every word is capitalized), the result would be: 20211027_720Pmp4 How "Proper Case" Works 20211027_720pmp4

720p MP4 (Converting the date and technical specs into a human-friendly title). Because your text contains an underscore ( _