Kernrechtsfrage
Whether the detention-extension procedure violated the statutory deadlines or the acceleration requirement in detention matters.
Extrahierter Entscheid
No violation occurred; the extension request and essential files were filed in time, the paper copies were lawfully requested later, and the provisional extension and final decision were timely.
Extrahierte Begründung
A timely written or electronic request satisfies Art. 227 StPO; the authority may require paper copies under Art. 110 Abs. 2 StPO. The sequence of filing, supplementary submission, provisional extension, hearing, and final decision complied with the statutory time limits and did not undermine the acceleration requirement.