bq. As a side note, if an image is uploaded using the Image Upload (Edit>Image>Upload>Choose File>Send it to the Server>Ok) the name of the file is properly shown in attachments. If however the image is just added as an attachment and then used, the + isn't shown.
OK, thanks [~ganechitoaei]. I guess that's the difference between [~cracky5457] and me. I created https://jira.xwiki.org/browse/XWIKI-19603 for the lost + sign.
I agree with [~camil7] that [~cracky5457]'s problem is most probably a setup problem. I think Apache HTTPD does something like this for example by default, see https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Installation/InstallationWAR/InstallationTomcat/#HApachefront-endserver (it's mentionning / and \ but I think it's the same problem with +).
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If image attachments aren't displayed, see this article.
