@Jim **********
this depends a lot on which office you're dealing with you can go on the app and they will send you a statement of the last 12 months in PDF form which you can print out and use. The problem is it's been reported and I know of one person that was able to use this after he had it printed out as is as it showed the 12 months of activity. I have also read about a couple other people who they insisted at immigration the printout stamped with a bank stamp I guess it's an official stamp of sorts.
The immigration in Pattaya was the one that took it straight from the app without having to have a seal from the bank or a stamp. Not sure where the others tried it and immigration insisted on the bank stamp