Just last week, we shared a newly discovered item inside Crossing the Animals: New Horizons which allows players to permanently copy any 2×1 objects. That wasn't the first of its kind to be discovered – Nintendo actually released the original track – but now we've got another one to try.
In the meantime, a new glitter has been discovered by a YouTube user Make Any Games
You will need to have one or more players subscribed to your island, which is why it includes your own, and you will want to send your selected items (Do Anything Games recommends sending 1-3 items at a time) to one of them by mail. Once that is done, you'll need to use the Call Resident app on your NookPhone to find the email recipient player in the game next to you.
Make mail recipients lead, and ask them to open their mail. They have to open gifts and throw things down, after which you have to use the Call Residence app again to play with a different player instead of your email recipient. Once they get into the game, spend some time; you should find out that things are still on the ground, and that if you repeat the process, your email recipient will still have these items in their mailbox, ready for you to do the whole thing over and over again.
If you're feeling a little confused, be sure to watch the video above to see all this work. It is likely that Nintendo will release this soon, so you should consider trying this soon if you are not careful to cheat the system a bit.