On this page:
https://help.market.envato.com/hc/en-us/articles/202821810-CodeCanyon-General-File-Preparation-Guidelines
there is a dead link under “Check Your Assets”:
https://help.market.envato.com/hc/en-us/articles/202822610-What-assets-can-I-use-in-my-items-
Here you go: