suggestions for UI/UX

hey guys ,so i am thinking create and upload some ui/ux on gumroad for a few bucks but
wanted to know that what exactly are the files you will need also in what formats etc.
if you were a client or something.

Like only the designs or codes of the app
or what kind of app designs generally?

Well I'd assume the standard would be .psd or .svg files but it depends on what you're offering. If you're selling app UI designs then I'd expect a figma file or similar.