Service Worker with webm and mp4 videos

[webgefaehrten]

I have embedded a video of about 6mb size, but it is not saved by the cache in any form. No MP4 no WEBM. I always get the following error: serviceworker-cache.min.js?v=5.0.13:1 Uncaught (in promise) TypeError: Failed to execute 'put' on 'Cache': Partial response (status code 206) is unsupported.