004 HTML5-Video
https://en.wikipedia.org/wiki/HTML5_video#Browser_support

007 uuid
https://www.npmjs.com/package/uuid

008 Firebase-Secure-Files
https://firebase.google.com/docs/storage/security/secure-files

011 Error-Code
https://firebase.google.com/docs/storage/web/handle-errors

016 Drag-and-Drop-Support
https://caniuse.com/dragndrop

018 Document-Reference
https://firebase.google.com/docs/reference/node/firebase.firestore.DocumentReference

028 Delete-File
https://firebase.google.com/docs/storage/web/delete-files

028 Storage-Security-Rules
https://firebase.google.com/docs/firestore/security/rules-structure#granular_operations