+When `async.chunkSize` is set, the selected files are uploaded chunk by chunk with the declared size. Each request sends a separate file blob and additional string metadata to the server. This metadata is in a stringified JSON format and contains the `fileName`, `relativePath`, `chunkIndex`, `contentType`, `totalFileSize`, `totalChunks`, and `uploadUid` properties. These properties enable the validation and combination of the file on the server side. The response also returns a JSON object with the `uploaded` and `fileUid` properties, which notifies the client what the next chunk is.
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