Here:
Lower court materials here.
Here are the materials in Yocha Dehe Wintun Nation v. Newsom (E.D. Cal.):
11-1 California Gaming Assn Motion to Intervene
11-5 Proposed Motion to Dismiss
21 Tribes Opposition to Motion to Intervene
22 State Opposition to Motion to Intervene
26 Tribe Opposition to State Motion to Dismiss
Prior post here.
Here is the complaint in Yocha Dehe Wintun Nation v. Brown (E.D. Cal.):