Sequential Queue
Upload files one at a time in strict order. The next file starts only after the previous one completes.
What you should see: strictly one file at a time: the next upload starts only after the previous one finishes, which keeps ordering deterministic.
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<core-upload asp-upload-url="/api/upload/upload"
asp-concurrent="1"
asp-multiple="true"
asp-progress="true"
asp-auto-upload="true">
</core-upload>One at a time
asp-concurrent sets how many files transfer simultaneously, and it defaults to 1. Sequential means files complete in the order they were added, each gets the whole connection, and exactly one progress bar is moving — which is easier to read than five moving together.
Sometimes order is a requirement
Pages of a scanned document, an import where later files reference earlier ones, or any server process that consumes uploads as a sequence. Raising concurrency there does not just reorder the UI, it reorders arrival at the server — so sequential is the correct setting rather than merely the cautious one.