[moin-user] Uploading a plugin to the moinmo.in wiki: not allowed?

[Lars Kruse]

Hello,

today I logged into my account in the moinmo.in wiki instance and tried to
upload a minor improvement to a plugin.
But sadly the attachment info page informs me, that uploads are not possible:
 https://moinmo.in/action/AttachFile/MacroMarket/FormatConverter?action=AttachFile

German error message: "Sie dürfen keine Anhänge an diese Seite anhängen!"
Translation: You may not attach attachments to this page!

Is someone aware of a change of permissions in the configuration of this
instance?

Cheers,
Lars