Is it CC0?
hi the licence for my available assets at the time of this reply is CC BY-ND. Hope this helps
You should add the license into metadata for the asset pack(s):
"Edit asset pack->Metadata->Release Info->License for assets" It will increase the size of audience that will be able to find your art
P.S Honestly, It isn't so quality (IMO) to apply BY-ND for it, I recommend BY-SA or plane BY...
You haven't added metadata yet
