In AWS S3 you have to set the correct mime-type when you upload a file, this can also be changed afterwards. If not, it remains binary (application/octet-stream).
It is possible to derive mime-types from extensions, though that is not perfect. See ZnMimeType class>>#forFilenameExtension:
> Is it possible to handle this with ZnEasy,
Not as it is today.
> or do I have to use the ZnClient and handle the stream first?
Yes, get the bytes and create the Form yourself.
> Cheers
> Andy
>