What documents do I need to provide as an online freelance teacher for my visa application in Thailand?

The user is seeking clarification on the adequacy of a certificate from their platform indicating they are working as an online freelance teacher for visa application purposes in Thailand. They are unsure whether this document needs to be stamped, if it is sufficient, or if additional details are required. Comments suggest obtaining a letter of verification from the platform or highlighting that the current document may not meet official requirements, as it does not resemble a traditional employment contract.