One of my players is planning on doing the UA ranger path; I found where you can add animal companions on a character sheet but unfortunately there is no Beast of the Earth in the system. I made a custom Beast of the Earth but I cant seem to add custom creatures to a character sheet. Is there a work around?

Probably a stupid question, but have you enabled homebrew content for that character sheet?

I have

Does the character sheet belong to your account or your player’s? The homebrew content needs to be in the collection of the account that owns the sheet (I think there are exceptions for accounts with membership or that are in campaigns with content sharing enabled, but I don’t remember exactly what the requirements are for that).

It belongs to my account atm AND it is in a campaign with content sharing;