I have entered 4 times in a year with at least several weeks between visits and flown long international distance with a return ticket. Was never questioned
I use the Google drive app on my phone which has a scan feature built in. Visit drive.google on your PC to download, this is assuming you have a Gmail account
I was able to change from retirement to marriage within Thailand your are not changing the visa just basis of which the extension is granted at renewal time
You're annual extension of stay needs to be done whilst you are in Thailand. Letting it lapse whilst outside voids your visa and you start all over again
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