I know it’s been a while, but I wanted to offer a solution, if only for those who come across this question via Google.
The issue is with the order of the parameters in the query string when you build the URL for the media uploader. My experience is that any parameters that come after ‘TB_iframe=1’ are ignored, so you want to put your custom values before this. I haven’t seen this documented (and haven’t explored core to see why the parameters are handled this way), but can’t think of any good reason for it–I probably spent an hour tearing my hair out before I discovered the issue.
I also haven’t tried this in 3.5 yet. With all the changes to the media uploader it’s possible that this has been addressed.
Related Posts:
- Using attachment_fields_to_edit filter inside plugin class
- Post Specific Uploader
- Limit upload file type on one custom post type
- Plupload Intergration in a meta-box?
- Trigger refresh for new media manager in 3.5
- Physical organization of wordpress media library (Real Media Library plugin)
- Can I upload media to a specific folder?
- wp_upload_dir how to get just the directory name .
- How to generate thumbnails when needed only?
- Limit image upload to one and disable audio, video and other document file types to upload
- How to add new tab to media upload manager with custom set of images?
- No Thumbnails Generated
- Media files exist in upload folder but not showing up
- How to Require a Minimum Image Dimension for Uploading?
- How to upload files straight to S3 without using local storage? [closed]
- Extend Media Library
- How does WP media uploader create the 3 different sized images, and how can I duplicate it
- How to make “Upload files”selected by default in Insert Media?
- WordPress 3.5: Setting custom “full URL path to files” in the Media Library?
- Get $image_id after uploading with media_sideload_image()
- simple solution for restricting access to (some) uploads/downloads
- what happens to existing media files when I switch to year/month directory structure format?
- Reject upload of wrong-sized images using the Media Uploader
- WordPress Media Uploader events
- How to show all available images in WP’s media library when using the Polylang plugin?
- how to upload and allow downloads of .mobi and .epub formats
- Upload post thumbnail from the front end
- Allowing WebP uploads?
- Give users a maximum upload capacity; limit the number of files a user can upload OR limit the number of files per upload
- How to add a custom field to the media screen (image/gallery)?
- Can’t upload media, permissions are correct
- How to assign multiple file-mime-types to extension?
- Saving Media – Which Hook is Fired?
- Set limit to media upload?
- Is it possible to reorganize the WordPress uploads directory?
- WordPress 3.5: Switch back to Old Media Uploader?
- Save camera info as metadata on image upload?
- Media upload finished hook
- Users can’t upload images on frontend if they haven’t got access to the wp backend
- How to upload SVG in WordPress 4.9.8?
- How Can I Organize the Uploads Folder by Slug (or ID, or FileType, or Author)?
- How can I batch delete all unattached images with WP-CLI or other automated process?
- Create image formats with different qualities when uploading
- Rename files during upload using variables
- upload_async.php returns 500 error
- Which filters or actions to use after a media upload and delete?
- Organize uploads by year, month and day
- wp_delete_attachment doesn’t delete images in wp-content/uploads/
- Display attachments by ID in a wp.media frame
- Force WordPress 3.3 to use Flash uploader
- Use a separate custom table (not posts) to handle file upload data
- Upload folder is not writable, even when permissions are correct
- Different upload directory based on post type in a theme
- Media not actually deleted on disk when click “Permanent Delete”
- Image upload callback in new 3.5 media
- retrieve custom image sizes from media uploader javascript object
- Add inline uploader to plugin option page
- Protecting direct access to PDF and ZIP unless user logged in (without plugin)
- How to wp_upload_bits() to a sub-folder?
- Using same directory for storing all uploaded images on a WordPress network
- Insert images to post not working
- Is it possible to allow zip files to be uploaded in WordPress?
- How to restrict images in v3.5 Media Library modal to only those from a specific post id?
- Allow CSV files to be uploaded
- Contact Form 7 – process form using a PHP script, instead of mailing [closed]
- Get an uploaded attachments local server path?
- How to add more upload directories?
- Change WordPress upload path and URL
- Could a large quantity of files in the uploads folder affect performance?
- PNG with transparent background turns black when uploaded and resized
- “Add Media” only shows “Full Size” under Attachment Display Settings
- Differentiate Featured Image from Post Images upon Upload
- WP 3.3 > Still no option to enable automatic image overwrites?
- Where do the favicons for Media Files come from
- How are the year and month folders added to the uploads directory?
- Where does wordpress store the FTP credentials?
- WP 3.5 media manager – how to create a working gallery frame
- Custom upload directory per CPT; when removed, file not deleted
- What might cause a POST to wp-admin/async-upload.php to return JSON >and< HTML?
- How to manage a standalone media folder?
- Send attachments via wp_mail from temporary folder
- Modify featured image path to Amazon S3
- wp_generate_attachment_metadata returns empty array
- Limit Media Library to Given Folder
- How to set an upload directory for each media type?
- Saving images from Gravity Forms repeatable File Upload as post attachments [closed]
- How do I link directly to uploaded files?
- Large Uploads in WordPress
- Is it possible to trigger some JavaScript when Media Popup is opened?
- How to call WP3.5 Media Library manager?
- Disable media library tab for non admins in uploader screen
- What permissions does wp-content/uploads need?
- Is wp_read_audio_metadata() function deprecated?
- WordPress monthly upload directory owner set to root
- wp_handle_upload() – how to upload to a custom subdirectory within uploads
- Settings in ‘Media > Settings’ is ignored when inserting images
- Set a maximum upload count for users on a specific user role
- can not upload file .vtt on wordpress 5.0.1
- Refresh wp.media after ajax call
- I want to replace a media file (pdf) with an updated version