What is the license?
These assets are Royalty-Free. You may use them in any of your commercial and non-commercial project(s) or edit them. Attribution is appreciated but not required.
SO is it CC0 (public domain)?
If yes, you should add the license into metadata for the asset packs:
"Edit asset pack->Metadata->Release Info->License for assets" It will increase the size of audience that will be able to find your art
