What are the requirements for extending a Non-B visa in Thailand if my employer is unhelpful?

The user is seeking advice on how to extend their Non-B visa for a year in Koh Samui without support from their employer, who says they need to handle it independently. Commenters explain that specific documents from the employer are essential for this process, including an audit of the company and proof of hiring Thai employees. The requirement for a work permit and the necessity of employer collaboration are emphasized, and it is noted that sole attempts to get an extension without employer assistance are largely unfeasible.