My knowledge is only based on my case that is similar to yours. They did not ask for those invoices but I added them along with confirmation of payment. I think their main concern is why you incorporated in 2023, your history and experience before and your goals. I was with the Canadian embassy.
I am in the same situation as you. I used to own a construction for a few years until I sold it and became a consultant and incorporated a new company in 2023 so I had to explain a bit of my background and history. I also attached invoices from clients and EFT confirmation. I would not go to the soft option right away, I am sure you will be approved.
It was a mix of both. I can share my letter with you if that helps. It is basic but it was also following a request for document from the embassy. Did you also include registration of the business. I am sure you did but just checking.
I think I was in a similar situation. I am a business consultant with my own limited company. My company pays me directly and my clients pay my company.
I wrote a letter explaining my work, my vision and name of my clients company, with a short descriptions for each client. It was brief but I got approved.
I used an agent in Phuket that was great. Got 2 visa for my girlfriend to France which is Schengen Space. You can also do the application yourself for I recommend an agent for this one.
Find a Thai that you are close to who you can send wise to and they will give you cash. I have done this after getting tired of the ATM cost and until I got a bank account. I did this for one year with no issue.
Less likely for your phone to stop working than losing a piece of paper. Sure, if you say this a rule. There was nothing on my embassy page and on my approval notes. Thaï are an advanced phone culture, so I go with the culture, not with my western ways.
The agent looked at my phone for 3 sec and stamped my passport. No question. Thai use their phone a lot more than us for daily life. Don't bother printing.