I noticed that sometimes an attachment is somehow "removed" from an
article. I've seen it with pdf and jpeg, although I don't know if the
two issues are related since the consequences are different.

For the pdf case, the name of the pdf file doesn't appear in the button for
the attachment and saving the attachment gives an empty file.

For the jpg case, the image is displayed as the border of a square in
white after the text, without any attachment button.

I attached the content part of said articles. Let me know if there is a
better way to attach them.

Julien.