You can blame the storage provider but ultimately it’s their fault. Anyone who takes archiving serious knows that you need at least 3 backups of your archive in different locations for cases like this.

Unlikely, Dolby tech support requires that the license for Vision or Atmos etc has been bought for that particular machine. Never seen a media player where the end user can buy the license separately.

edit: Also those Android boxes only support DV Profile 5, which is DV used for streaming, If you want to play a UHD BluRay rip in mkv format in the highest quality DV profile, Profile 7 with Full Enhancement Layers, you need to find a Oppo 203 or 205 or one of the clones. Those are basically the only players that can play UHD BD mkv with DV Profile 7 FEL.