Fix WordPress Upload Error

I'm encountering an error message on my WordPress site that says, "The link you followed has expired." This happens when I try to upload a plugin or theme file. I need someone to help fix this issue.

Requirements:
- Expertise in WordPress
- Familiarity with file upload configurations
- Ability to troubleshoot and resolve error messages

Ideal Skills and Experience:
- Experience with WordPress file uploads
- Knowledge of PHP and server settings
- Previous experience resolving similar issues

Please ensure you check the file size and type requirements for uploads.