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docs: describe transfer lifecycle across UI close and session end - #6082

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Documentation for vaadin/flow#25431 by @totally-not-ai[bot].

Note

The source pull request is merged, so this documentation describes the final
shape of the change. Please review it and mark it ready for review.

Change categories: BEHAVIOR_CHANGE

File Change
articles/flow/advanced/application-lifecycle.adoc Note that a UI serving an ongoing upload or download stays attached to its session until the transfer is handled, and that invalidating the session instead terminates any ongoing transfer.
articles/flow/advanced/upload-resources.adoc Explain that an ongoing upload keeps its UI attached across a close/tab-close so its callback still runs, but is terminated and discarded if the session is invalidated.
articles/flow/advanced/downloads.adoc Explain the same lifecycle for download progress listeners: they keep firing for a download whose UI has closed, but are notified through onError instead of onComplete if the session ends first.

Auto-generated by the Documentation Bot — review before merging.

Generated by Documentation Bot for #25431 · agent · 103.8 AIC · ⌖ 6.17 AIC · ⊞ 11.2K ·

  • expires on Oct 18, 2026, 1:09 PM UTC

Explain that a closed UI stays attached until its ongoing upload or
download finishes, and that invalidating the session instead
terminates that transfer, on the application lifecycle, uploads, and
downloads pages.

Documents vaadin/flow#25431 (`9d8ad814fa8c97d9ef20415e360695c875b3d28d`).
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@peholmst peholmst added the target/v25.3 Automatically cherry-pick to the v25.3 branch label Sep 18, 2026
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