Kern County Superior Court has updated its local rules here. Of appellate note, Rule 1.10, covering electronic filing and service, includes subdivision (k)(14) (effective 1/1/21) noting that "Any appeal-related documents" are "not eligible for submission through electronic filing and must be filed through conventional methods."
File this under "yet another e-filing system that fails to account for appellate filings."
On other fronts, here's a nice turn of phrase (from this unpub): "The parties have engaged in protracted and torturous litigation, and the arbitrator in the second arbitration characterized it—in our view fittingly—as a “black hole of expense and rancor.”"