Problem

If an attachment link is copy-pasted from a rendered page and used multiple times on another page, initially only the most recently inserted duplicate previews. After idling on the page for ~1-2 minutes, all of the copy-pasted links to that attachment stop previewing (no ?preview= parameter added on click), and users see "The file cannot be displayed. Error: The file does not exist." Opening in a new tab/download still works.

Environment

Confluence DC

Steps to Reproduce

1. Create Page A. Upload an Office file (e.g., .docx).
2. Insert an attachment link to that file on Page A and confirm preview works.
3. Create Page B.
4. From the rendered view of Page A, copy (Ctrl+C or Cmd+C) the visible attachment link and paste it into Page B. Save Page B → click → preview works.
5. Paste the same attachment link again on Page B (now two identical links). Save.
6. Click the newest pasted link → preview works; click the earlier duplicate → preview fails (no response or “file does not exist”).
7. Wait ~1–2 minutes
8. Click both links again → neither previews (no ?preview= appended), both show “file does not exist”.

Expected Results

All links referencing the same attachment should preview consistently.

Actual Results

• Initially, only the most recent duplicate preview works; earlier duplicates fail.
• After a short idle, all copy-pasted duplicates fail to preview.

Workaround

Copy the attachment link from the page edit mode or reinsert each link using the editor’s Link dialog.

Bug Demo Video

bug_demo.mov