it looks like you store the files in the ASD - application specific directory...
so you should look for them there... see also how to still be able to see the files on Android 10+ devices here
remember: starting with SDK30 you should follow the new Android file access restrictions and save your text files in ASD or if you like to use them in other apps then save them in shared storage like /Document or /Download
see also the overview by @Anke here
Taifun