If you need your end-users to share media files with you or need to share important documents with your end-users, you can use the Media node to send or receive media files supported by the channels you have set up in Flow.
To utilize inbound and outbound media file sharing from an external system your third-party service provider needs to have upload and download APIs available. The request and response types that need to be handled by your APIs should be one of the following:
File Size Limit
'pdf', 'doc', 'docx', 'ppt', 'pptx', 'xls', 'xlsx',
'jpg', 'jpeg', 'png', 'usdz'
'aac', 'amr', 'mp4', 'mp3', 'opus'