Max File Count

Limit the number of files that can be uploaded. The uploader rejects additional files once the limit is reached.

What you should see: at most 3 files. Select a 4th and it is refused, with the first three left untouched in the queue.

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<core-upload asp-upload-url="/api/upload/upload"
 asp-max-count="3"
 asp-multiple="true"
 asp-progress="true">
</core-upload>

Capping how many

asp-max-count limits the number of files in the queue. It maps to the component's maxCount, which is an alias for maxFiles — asp-max-files sets the same limit under the newer name.

Size limits do not cover this

A size cap does not stop someone selecting a whole folder. A count keeps the queue legible, keeps the request pattern predictable, and gives an error the user can act on: “10 files maximum” is clearer than an upload that starts, occupies the connection for minutes, and fails partway.

Show the cap in the interface. A limit discovered by tripping over it reads as a fault rather than a rule.