Storage space is not a download entitlement
A device can have free disk capacity while a particular origin faces browser-managed storage limits. Conversely, stored application metadata can exist even when no playable programme has been downloaded. Do not equate an installed web app icon or a large cache with a complete offline library.
For an illustrative trip, a viewer should verify the service's own download feature, the selected episode's completed state and any stated access period before leaving. Merely opening the episode online can populate some storage without preserving all required media, keys or account checks for later use.
Eviction and deletion differ from a failed transfer
MDN documents best-effort storage and circumstances in which browser data can be evicted, including storage pressure. Browser-specific policies and granted persistence affect the result. Avoid promising one fixed quota or retention period across every browser and device.
If previously available local content disappears, distinguish user-cleared site data, another browser profile, an origin change and browser-managed eviction. Those are different possibilities. A failed new download is another state again. Record what existed before and which action or condition preceded the loss rather than treating every missing item as an account cancellation.
A practical readiness record
For supported offline use, retain the browser profile or app context, the title and episode, the completed-download indicator and the service's expiry instructions. Check the intended offline operation through the supported interface. Do not inspect or share protected account resources as a way to manufacture a portable copy.
Before clearing site storage as a troubleshooting step, consider whether it will remove downloads, local preferences or sign-in state. Use the product's documented removal or refresh action where available. A generic cache clear can erase useful local data while leaving an upstream delivery or entitlement problem unchanged, so its consequences should be understood before applying it.
Questions about this guide
Does free disk space guarantee a browser download will fit?
No. Browser origin quotas and storage policies also matter.
Is streamed media in a cache a permanent offline copy?
No. Use only the service’s supported offline feature and its stated conditions.