Question juridique clé
Whether the appeal met the mandatory requirements of Art. 42 BGG and could be examined on the merits.
Solution extraite
The appeal did not satisfy the minimum requirements because it failed to explain sufficiently how the challenged decision violated federal law.
Motifs extraits
The only timely filing did not contain a sufficiently reasoned challenge to the facts or the legal assessment; the later supplementary submission was filed after the appeal deadline and could not be considered.