Event Handlers

React events mirror core upload state.

tsx

<UpupUploader
    uploadEndpoint="/api/upload-token"
    onFilesSelected={files => console.log(files)}
    onUploadStart={() => console.log('started')}
    onFileUploadComplete={file => console.log(file)}
    onUploadComplete={files => console.log(files)}
    onError={message => console.error(message)}
/>

Common handlers:

Handler	Called when
`onFilesSelected`	Files enter core state.
`onFileRemoved`	A file is removed.
`onUploadStart`	Upload begins.
`onFileUploadProgress`	Byte progress changes for one file.
`onFilesUploadProgress`	Aggregate byte progress across the batch.
`onFileUploadComplete`	One file succeeds.
`onUploadComplete`	All files succeed.
`onError`	A validation, config, network, or provider failure occurs; delivers a message string.

File objects use the UploadFile contract from @upupjs/core/contracts.