HI
I have updated DataTypes from Media.Picker (legacy ) to Media.Picker3.
All seems good, DataTypes updated as expected.
Only issue is have is that existing images do not render within image property of the node in back office, only name and checkered thumbnail.
Media section displays the image as expected.
I do have the media file system for the media folder pointing to a shared folder, but dont think this may be the cause as i can view the images in the media section.
Debugging via browser developer tools, the path to the image from the node image fields have HTML entities within it.
/umbraco/backoffice/umbracoapi/images/GetBigThumbnail@originalImagePath=https%3A%2F%2FdomainPath%2Fshared-media-path%2Frandom-folder%2Fmy-image.jpg&rnd=0.8765483782738723
Has anyone had this issue updated media.Picker ?
Dibs
Issue raised and closed by Umbraco CMS issue tracker on GItHub :
opened 05:55PM - 23 Oct 25 UTC
closed 06:30AM - 24 Oct 25 UTC
type/bug
### Which Umbraco version are you using?
v8.17.2, v8.18.5, v8.18.15, v10.8.11, … v11, v12, v13, v14, v16
### Bug summary
Media Picker 3 fields with media section images stored on server/share from Umbraco 8.17.2 database not rendering thumbnail images after upgrading process to any version after 8.18.5. Once Issue rasied in Umbraco 8.18.6 , any upgrade onwards persists the issue.
### Specifics
_No response_
### Steps to reproduce
Following the upgrade from Umbraco 8 to latest https://docs.umbraco.com/umbraco-cms/fundamentals/setup/upgrading/version-specific/upgrade-from-8-to-latest
Current Umbraco 8.17.2 instance has media storage folder server/share making use of https://our.umbraco.com/documentation/Extending/FileSystemProviders/
Build and run Umbraco 8.17.2 instance via Visual Studio 2022.
Log into back office. Able to view Node Media Picker (legacy) and Media Picker3 fields thumbnail image content within content section of back office. Able to view images from within media section
First step, upgraded to Umbarco 8.18.15, via Visual Studio 2022 NuGet Pacakge Manager.
Build and run Umbraco 8.18.15 instance via Visual Studio 2022.
Log into back office. Unable to view Node Media Picker (legacy) and Media Picker3 fields thmbnail image content within content section of back office. Browser dev tools show 401 Unauthorised error from Request URL making use of umbraco/backoffice/UmbracoApi/G etBigThumbnail?orignalImagePath=
Able to view images from within media section.
Second step, after searching and coming accross https://github.com/umbraco/Umbraco-CMS/issues/14140
Reverted to back to Umbraco 8.17.2 instance, upgraded to Umbraco v8.18.5.
Build and run Umbraco v8.18.5 instance via Visual Studio 2022.
Log into back office. Able to view Node Media Picker (legacy) and Media Picker3 fields thumbnail content within content section of back office. Able to view images from within media section
Third step. Upgarde Umbraco 8.18.15 to Umbraco 10.8.11, via Visual Studio 2022 NuGet Pacakge Manager.
Build and run Umbraco 10.8.11 instance via Visual Studio 2022.
Log into back office. Unable to view Node Media Picker (legacy) and Media Picker3 fields thmbnail content within content section of back office. Browser dev tools show 401 Unauthorised error from Request URL making use of umbraco/backoffice/UmbracoApi/G etBigThumbnail?orignalImagePath=
Able to view images from within media section.
Fourth step, Added remote server/share folder via https://docs.umbraco.com/umbraco-cms/extending/filesystemproviders to Umbraco 10.8.11 instance.
Build and run Umbraco 10.8.11 instance via Visual Studio 2022.
Log into back office. Unable to view Node Media Picker (legacy) and Media Picker3 fields thumbnail content within content section of back office. Browser dev tools show 401 Unauthorised error from Request URL making use of umbraco/backoffice/UmbracoApi/G etBigThumbnail?orignalImagePath=
Able to view images from within media section.
Fifth step, uploaded new image via media section, image uploaded to remote/share folder ok.
From within a node in the content section, adding an image to the node media picker3 field you are able to view the newly uploaded image for selction, but not the images that are already on the remote/share.
### Expected result / actual result
Upgrade Umbraco 8.17.2 version to Umbraco 8.18.15, MediaPicker3 fields to render thumbnail images already uploaded to the remote/server folder within back offcie content section
Upgrade Umbraco 8.18.15 to Umbraco 10.8.11, continue MediaPicker3 fields to render thumbnail images already uploaded to the remote/server folder within back offcie content section.
Continue MediaPicker3 fields to render thumbnail images already uploaded to the remote/server folder within back office content section during upgrade process to the leaste verison.
Has anyone one come across MediaPicker3 field thumbnail content not rendering after upgrading to any Umbraco version after 8.18.5 ?
Media Picker (Media Picker Legacy & Media Picker 3) has broken big thumbnail after updating to version 8.18.6 (Image stored in AWS S3) · Issue #14140 · umbraco/Umbraco-CMS · GitHub this was also closed with same issue
Any assistance would be great
Dibs
Have you cleared the data folder / cache folders since the upgrade?
Stop the site clear /umbraco/data folder and start up again.
Hi Steve
yeah i have tried deleting the TEMP folder under DATA folder, made no difference.
Dibs
EssCee
October 31, 2025, 6:56pm
5
Out of curiosity is it possible to upload a new image to see what happens? Does it save to the same/correct location
Hi SC
yeah new uploading of assets work as expected
Dibs
Hi
Further update…
I my case i continued to up grade Umbraco to the latest version at the time 16.3.3, from latest 8 to 10 to 11 to 12 to 13 to 14 to 15 and lastly 16.3.3.
And i was able to view image thumbnails within media picker fields of a node
Dibs
system
December 3, 2025, 11:43am
8
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