Community rules

Five of them. They are part of the terms, and they are short enough to read before you upload.

1. Only share what you made. Clips from Asset Store packs, motion libraries, Mixamo, other games or other people here are not yours to share, and editing one does not make it yours. The Workbench blocks the ones it can recognise – that check is a help, not a permission.
2. Public means public. Under CC BY 4.0 people may use and change your clip, also commercially, as long as they credit you. You cannot take that back later. Choose private if you do not want it.
3. Describe honestly. Title, tags and preview should match the motion. Someone is going to import this into their project on the strength of a five-second loop.
4. Report real problems only. A report hides a clip immediately, before anyone has looked at it. That works because reports are rare and meant. Reports made knowingly false count against your account.
5. Repeat violations end the account. A removed clip is a strike; three strikes suspend the account. Re-uploading a removed clip is blocked.

Something here that should not be? Report it on the clip page, or use the takedown form if you are the rights holder – no account needed for that.