Issue Summary

• Attachments can have special characters like the one below in their file name.
  • https://util.unicode.org/UnicodeJsps/character.jsp?a=2028
• And when uploaded, and added to a page, it appears fine, but publishing it causes the page to break and cannot be loaded or edited again.

Steps to Reproduce

1. Create a page, and upload this images in the zip file below.
   • Files.zip
2. Both image can be uploaded and will appear fine in preview.
3. Publish the page, and the page will not load with this error message.

   • We couldn't display your content

4. For the image without the unicode, the storage format will show that the image is linked correctly.

   • <ac:image ac:align="center" ac:layout="center" ac:original-height="800" ac:original-width="1280">
         <ri:attachment ri:filename="Name.png" ri:version-at-save="1" />
     </ac:image>

5. For the image with the unicode, the link to the file is broken, causing the issue.

   • <ac:image ac:align="center" ac:layout="center" ac:original-height="800" ac:original-width="1280">
         <ri:attachment ri:version-at-save="2" />
     </ac:image>

6. It appears that the unicode caused the link to the image to not be generated.

Expected Results

• Either,
  1. The attachment should fail to be uploaded, with a user friendly error message.
  2. Or if we want to upload there types of files, the link to the attachment should be generated, and displayed correctly.

Actual Results

• Attachment uploads sucessfully, but not linked, causing the page to not load any content and becomes uneditable.

Workaround

• Use a Unicode detector to find and remove the special character, and reupload the attachment.
• Content needs to be edited via source or Rest API.