They could have sent a standard description. Write a cover letter in which you explain what you've just explained in your post. Send the pay slip you already have. Try to think of something you might have, to show on top of that. You haven't sent the extra letter written by the CEO of your company yet, have you?
Not sure about "The photos must show the date and time they were taken" though. You won't be able to have metadata imported into the final PDF. If they had written day only, I would have suggested to buy a newspaper and make pictures of all pages on it. No idea how you could prove at what time they were taken...
Participant(e) anonyme Not all embassies have such a list. They usually publish it on their website. You can go to any translation office I suppose, and ask if they provide certified translations from the source language into English or Thai.
2. Why is that an issue? Upload videos of yours and provide links, show them scripts. Provide a CV. Portfolio could be a list of videos you have produced, for which clients, etc.
3. No, you can have something else. You are a micro-entrepreneur? Get a "Certificat d'inscription au Répertoire des Entreprises et des Établissements (SIRENE)".
What is the accountant supposed to guarantee? Maybe explain in a letter that you do not have to hire one from a legal perspective and provide something else as a replacement. Tax returns? Have your tax returns notarized?