98% of animations in the repository are F2E. All the rest are F2U. The only ones that ‘aren’t’ F2E are maybe BwdYeti’s animations because he’s a special snowflake tradition, maybe. Idk. He’s really touchy about people editing his stuff.
For literally any other animation, feel free to edit and release it. Make sure to credit the original artist(s) and people, point out the original animation you edited, etc. Just do that and you won’t have problems.
It’s portraits where things get way murkier… just assume those are F2U unless labeled F2E. You can also check the thread for artist credits, or check the artist’s page, or message the artist if you’re not sure. Always give credit if you edit someone else’s work. That alone will engender you a lot of goodwill.
Don’t be an Evius. Don’t be a Chrobin. Just give credit when editing/using things, and most people will offer a gentle correction if you err.
You did great! Thanks for the submission and welcome to the community.