Bestand importeren

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'application/pdf, ' +
'application/msword, ' +
'application/vnd.openxmlformats-officedocument.wordprocessingml.document, ' +
'application/vnd.ms-excel, ' +
'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, ' +
'text/plain, ' +
'application/vnd.ms-powerpoint, ' +
'application/vnd.openxmlformats-officedocument.presentationml.presentation, ' +
'text/markdown';