To save files all you do is (either in the new editor or the old one) click on the little gear thing and then there should be two little icons that look like pieces of paper. One of them has a green arrow pointing up (upload files) and the other one has a red arrow pointing down (download files). You just click the one with the red arrow when you're done making the anim and then it will turn it into a file. Then you upload the file here and copy the link: https://ufile.io/ I literally just figured out how to use files too lol

To upload files somebody has given you just go to the new beta editor and click on the little gear and look for the paper that has the green arrow pointing up, click on that and then select the file.

Thanks!

^w^