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From: Uwe Brauer <oub@mat.ucm.es>
Subject: html message with attachment is not displayed
Date: Mon, 30 Mar 2020 09:22:15 +0200
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Hi

>From time to time I receive message, perfectly displayed in thunderbird,
but in gnus I only see:
,----
| 
| From: Joe Doe
| Subject: Algunos videos y diapositivas actualizadas
| To: Uwe Brauer <oub@mat.ucm.es>
| Date: Mon, 30 Mar 2020 08:07:26 +0200 (4 minutes, 45 seconds ago)
| Attachments: [3. application/octet-stream]... [5. application/pdf]... [7. text/plain]...
| 
| [3. application/octet-stream]...
| 
| [5. application/pdf]...
`----


Which is  completely useless.

I tried the setting 
  (setq gnus-mime-display-multipart-alternative-as-mixed nil) 
  (setq  mm-discouraged-alternatives     nil)


Or 

  (setq  mm-discouraged-alternatives      '("text/html"  "multipart/related" "multipart/alternative")) ; quotes ok
  (setq gnus-mime-display-multipart-alternative-as-mixed nil) ; 

None helped.

What is wrong here?

Help, message I cannot read are useless.

Thanks 

Uwe Brauer