# All execution attachments return HTTP 400 – preview/download impossible

**URL:** <https://community.smartbear.com/t/all-execution-attachments-return-http-400-preview-download-impossible/842>\
**Category:** Zephyr\
**Tags:** test, api\
**Created:** [November 3, 2026, 5:03pm UTC](https://community.smartbear.com/t/all-execution-attachments-return-http-400-preview-download-impossible/842 "2026-11-03T17:03:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Akash\_Kishore](https://yyz1.discourse-cdn.com/flex049/user_avatar/community.smartbear.com/akash_kishore/32/1082_2.png) [@Akash\_Kishore](https://community.smartbear.com/u/Akash_Kishore)\
**Post date:** [November 3, 2026, 5:03pm UTC](https://community.smartbear.com/t/all-execution-attachments-return-http-400-preview-download-impossible/842/1 "2026-11-03T17:03:50Z")

</div>

**Site:** [kpn.atlassian.net](http://kpn.atlassian.net)  
**App:** Zephyr Essential – Test Management for Jira, installed version **9.2.0** (Atlassian shows “Outdated”)

**Problem**  
No test execution or test step attachment can be previewed or downloaded. Thumbnails show as broken images, and the download spinner never finishes. This affects historical attachments **and newly uploaded attachments**. Uploading succeeds, and the attachment list (file names and sizes) loads correctly.

**Technical details**

- Every attachment request returns **HTTP 400** , for example:  
`GET https://prod-play.zephyr4jiracloud.com/connect/public/rest/api/1.0/attachment/1197d777-ae2e-401e-9889-99ceaf546779/thumbnail?acpt=…&projectId=10356&issueId=1972066`  
at 2026-11-03 15:58:53 GMT
- Response body:

{“errorType”:“ERROR”,“clientMessage”:“We encountered some problems during processing this request. Please try again!”,“errorCode”:134}

**Example**  
Project ID 10356, issue EPS-1165 (ID 1972066), cycle “Q-update 26C”, folder “Procurement”, execution executed 10 Aug 2026. Step attachments such as `image_20797.png` (0.19 MB) and `image_84101.png` (0.17 MB).

 ![Screenshot 2026-11-03 210118](https://canada1.discourse-cdn.com/flex049/uploads/smartbear_prod/original/2X/6/689523530a6152a435c7b8fad28cec59e02c6eb3.png)

**Impact**  
These attachments are required evidence for an ongoing **audit**. Teams cannot retrieve past test evidence.

**Questions**

1. Is this a known issue, for example for sites still on app version 9.2.0? Will updating to 12.0.0 fix it?
2. Are there known issues or steps we need to take when updating from 9.2.0 to 12.0.0?

Kind regards,  
Akash Kishore – Jira Admin, KPN