[ZendTo] Drop-off for external users [5.23.2]

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Hi all,

Hope you're well.

In my preferences.php, "allowExternalUploads" is set to TRUE but 
external users cannot upload files even if they have been given a 
request code and have received the confirmation e-mail with the upload 
link.

The upload progress bar ends up with an error message saying one must be 
logged in as an internal user to send files !

Am I missing something ?
Thanks.

Francois