Questione giuridica chiave
Whether the federal appeal was sufficiently reasoned under Art. 42 and 106 LTF.
Decisione estratta
No. The appellant did not explain, even briefly, why the cantonal inadmissibility judgment was unlawful or how the cantonal procedural rules were wrongly applied.
Motivazione estratta
The submission merely explained the non-payment of the advance and did not challenge the legal reasoning of the cantonal court or invoke legal-aid or deadline-restoration grounds.