What this problem is
WordPress shows: Missing a temporary folder when uploading media or updating plugins/themes.
Why it happens
- PHP temp directory not configured
- Temp folder exists but is not writable
- Disk space/inodes exhausted
Prerequisites
- Hosting panel access (PHP settings) and file access
Diagnosis
Check server/PHP settings for upload_tmp_dir. Verify disk space and permissions.
Detailed steps
Step 1) Set a writable temp directory
In PHP settings, set upload_tmp_dir to a writable path (host-specific). Some hosts allow setting it via php.ini or panel.
Step 2) Create folder and permissions
Create the folder if missing and set safe permissions so PHP can write to it.
Step 3) Retest uploads/updates
Upload a small image and update a small plugin to confirm.
Expected results
- Uploads and updates work without the temp folder error
What to do if it fails
- Ask hosting support to configure PHP temp directory and confirm account quotas are not exceeded
Best practices
- Monitor disk/inode usage and keep PHP settings consistent across environments