I got the visa pdf and soft power invoice printed off (a6 size) and laminated. Visa one side and documents on the other. Have done 2 land border crossings but haven't been asked as yet
Keep at it,im not technically savy but had great help from everyone. It was really straightforward after a bit of research from the search function. Don't stress it.
they will send you an email of the date and time ( sofin space,siam square to book your place) if you can't make it they will sent you link for Google meet online.