yes and if you do that make sure to do this from a company letterhead and from the Director , possibly she meant to see an official company document too showing tha tthe company is a genuine company this shouldn't be too hard to provide most countries have some form of official company document registration you an get online.
what Andi is saying here is also true you may or may not need the above but its good to assume the worst and be able to prove if you need it because they ask you. If you can bring a copy of these in case you need then you will be prepared and will be able to reduce time to get your visa. I got mine in 3 days at Jakarta without needing proof of business income FYI but had them just in case i needed to show regardless.
I added more by editing my above post as i hit enter too early but Also of course you will need Passport photos Show the required funds in your bank account etc etc above I am just answering the question as to what you need for company owner working remotely
You need to provide them with *a copy of your Official company incorporation documents.*write a "to whom it may concern "company letter with company letterhead giving permission from your company for yourself to work remotely from Thailand for a period of 5 years . Also make yourself a work contract if you don't already have one again with official company letterhead for the role you are doing in your business. I did mine using chat gpt and made sure to put in the contract permission to work remotely once more. This should be enough but I suggest to be prepared to show proof of your funds being able to support yourself even though i didn't need this myself ( i applied in Jakarta in person) it may vary depending on the embassy you apply at.
definitely leave 3 working days see hours in my pic here- you can only submit between 9and 11:30 only if you get there at 1135 am you will have to wait till next day to submit collecting is similar only collect after 130pm to 3pm only . if you have all your documents in order then your collect slip will be 3 working days later so yes submit monday morning then collect Thursday afternoon. this was my experience last week submitted wednesday and collected monday