The hotel did it for me. I stayed in pattaya for the test and go, but did my 2nd pcr test in buriram. I emailed the hotel the result and asked them to submit it the same way they did the test and go result. They were happy to do it for me they said. Not sure what I'd have done if they did not cooperate as like you the app supplied was crap and I couldn't see a way to upload it either. Suggest you ask the hotel nicely if they would do the same as me.
Well don't go to Hotel Tropicana in Pattaya. I got out at about 7pm today. The test was 8am-ish after check in the night before about 8pm. A full 24 hours before release. I've read / been told about really quick turn around - this ain't one of them. Shame as they were very efficient in the Summer, but won't be using them again for a test and go.
the ones for dose 1 and 2 of vaccine on the NHS spp for proof of your vaccination status. Dont worry about any booster, they just want the QR codes of the first 2. Crop just the qr and upload each in the optional section. You need to make sure it's not blurred. I found it best to take a photo of it with my phone and crop so there is a small gap around the edges. Then emailed the photos to myself, and then dragged the photos to the bit on the screen. It should then tick away in the background and either accept each one or tell you it's invalid. I had 3 attempts on this and finally got them accepted.
I applied for it yesterday online and got it approved in 4 hours. Just make sure you spend the time getting all the documents uploaded in a readable format. Upload the qr codes separately for the vaccine proof where asked(its optional but do it), cropping the qr codes and make.sure not blurred etc. It took about an hour of faffing around with the images but in my opinion worth it in the end as very surprisingly it was approved in 4 hours from submission