Upload Wizard uses chunked uploads to provide better reliability during the upload of large files. In addition, it allows a greater maximum file size (4 GB as opposed to the usual 100 MB).
During a chunked upload, the file is split into small parts and these parts are uploaded. If some parts failed to upload, the whole file does not have to be re-uploaded, only the parts that failed. All this is done in the background in UploadWizard.
Dies ermöglicht einen stabileren Hochlade-Prozess nicht nur im Hochlade-Assistenten, sondern auch für Bots, die die API zum Hochladen von Dateien nutzen.