Can I use a 60-day Thai TR visa issued from the US after arriving in Thailand on an exempt entry and a TR extension?

I'm from the US on a 45 day exempt and now a 30 day TR extension. I got a 60 day TR e-visa from the US but it came 3 days after I had already arrived to the Kingdom. Can I still use the 60 day visa on say a RT flight to Singapore and back to Thailand .. or is the TR visa only good from the country that issued it? Thanks for your info and time.