How should I format my supplements?

I have finished my supplements, and some schools require you to upload a 500kb file, instead of copying/pastying the essay into a text box. Is there a specific combination of font/size/spacing I should use? Also, should I include my name/common app ID in the file?

Thanks!

Name/common app ID is not needed, you uploaded it using your account. They can easily identify where it came from.

Font: choose anything you want that makes sense. Arial, Times New Roman, works.
Size: For most fonts, anything in the range 10-12 should be fine. Lean towards 11 and 12.
Spacing: Single, with something to indicate paragraph breaks.

Thank you @Kyuutoryuu !