# PDF files are not opening after latest update
**URL:** https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870
**Category:** Pydio Cells
**Created:** [December 10, 2025, 7:16pm UTC](https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870 "2025-12-10T19:16:32Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Amanuel\_Elhanan](https://forum.pydio.com/u/Amanuel_Elhanan)
#### Post date: [December 10, 2025, 7:16pm UTC](https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870/1 "2025-12-10T19:16:32Z")
For first post, please answer the questions below!
### Describe your issue in detail
I have updated cells to the latest version ([4.4.16](https://github.com/pydio/cells/releases/tag/v4.4.16)) recently, after that I am getting blank when I click on PDF files, some PDF files works fine but most of the PDF files in cells are not opening although some shows the preview on the right side.
There is no cells.service logs while opening the PDF file but browser console shows some error log, here it is:
```auto
https://mycells.net/io/PATHTO/MY%20(PDF)/img20251124_15150191.pdf?AWSAccessKeyId=gateway&Expires=1765393298&Signature=mBVXfnm93JAeNU/BYAKkr7f1W2w=&pydio_jwt=o77pulGdzQdbOCP0m3fYM-RYucksDkTD3n4phvLLzEE.O5rrZQULE-jhEDxOr3tQFmtk7IhRudY3IJV4x0AoACo 403 (Forbidden)
PDFFetchStreamReader @ VM962 pdf.mjs:12821
getFullReader @ VM962 pdf.mjs:12783
(anonymous) @ VM962 pdf.mjs:15189
#createStreamSink @ VM962 pdf.mjs:7523
#onMessage @ VM962 pdf.mjs:7370Understand this error
VM961 viewer.mjs:16795 Unexpected server response.
PDF.js v5.4.296 (build: f56dc8601)
Message: Unexpected server response (403) while retrieving PDF "https://mycells.net/io/PATHTO/MY%20(PDF)/img20251124_15150191.pdf?AWSAccessKeyId=gateway&Expires=1765393298&Signature=mBVXfnm93JAeNU/BYAKkr7f1W2w=&pydio_jwt=o77pulGdzQdbOCP0m3fYM-RYucksDkTD3n4phvLLzEE.O5rrZQULE-jhEDxOr3tQFmtk7IhRudY3IJV4x0AoACo".
_otherError @ VM961 viewer.mjs:16795
await in _otherError
_documentError @ VM961 viewer.mjs:16772
(anonymous) @ VM961 viewer.mjs:16721
Promise.then
open @ VM961 viewer.mjs:16709
run @ VM961 viewer.mjs:16492
await in run
webViewerLoad @ VM961 viewer.mjs:18326
(anonymous) @ VM961 viewer.mjs:18330Understand this error
VM962 pdf.mjs:419 Uncaught (in promise) ResponseException {message: 'Unexpected server response (403) while retrieving …zEE.O5rrZQULE-jhEDxOr3tQFmtk7IhRudY3IJV4x0AoACo".', name: 'ResponseException', status: 403, missing: false, stack: 'Error\n at BaseExceptionClosure (https://cloud.l…g/editor.pdfjs/res/dist/pdfjs/build/pdf.mjs:422:2'}
```
### What version of Cells are you using?
4.416
### What is the server OS? Database name/version? Browser name or mobile device description (if issue appears client-side)?
Fedora Server
### What steps have you taken to resolve this issue already?
Tried running resync scheduler on cellsdata but still the same, I checked recent change logs and it seems some of the commits include some changes in PDF.js, so I am suspecting that.
---
### Author:  [@Amanuel\_Elhanan](https://forum.pydio.com/u/Amanuel_Elhanan)
#### Post date: [December 11, 2025, 8:50am UTC](https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870/2 "2025-12-11T08:50:27Z")
The PDF files I have tested just works fine with Libre Office Documents which I have integrated with Cells.
---
### Author:  [@c12simple](https://forum.pydio.com/u/c12simple)
#### Post date: [December 16, 2025, 8:25am UTC](https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870/3 "2025-12-16T08:25:56Z")
Hi @Amanuel_Elhanan
Try to drop this file to the root of a workspace, rename it by a simple name avoiding special characters. Just make sure there is no problem at reverseproxy level.
---
### Author:  [@Amanuel\_Elhanan](https://forum.pydio.com/u/Amanuel_Elhanan)
#### Post date: [December 17, 2025, 6:44am UTC](https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870/4 "2025-12-17T06:44:52Z")
Hi @c12simple
I tried all of those steps, uploading a pdf on Personal Files workspace a pdf file with non-special character name. I am using caddy as reverse proxy I checked that too. This thing is working perfectly with the same setup before the update. I am assuming there is some change in PDF.js implementation, checking on the commits on github.
---
### Author:  [@charles](https://forum.pydio.com/u/charles)
#### Post date: [January 3, 2026, 9:18am UTC](https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870/5 "2026-01-03T09:18:08Z")
Hello @Amanuel_Elhanan sorry for the late answer - we noticed issues as well.
We did update PDF.js in the last version, we’ll have to find the issue and provide a patch for this. We’ll keep you posted
---
### Author:  [@system](https://forum.pydio.com/u/system)
#### Post date: [January 30, 2026, 8:34am UTC](https://forum.pydio.com/t/pdf-files-are-not-opening-after-latest-update/7870/6 "2026-01-30T08:34:41Z")
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