After reading Some basics on Android storage system you meanwhile know, that you can’t store something to arbitrary directories anymore
Concerning 1 and 2, show us a Do it result of the path… are you sure, the file was not saved or are you not able to find it? Use Total Commander to access the ASD of the companion app or your own app…
EDIT: you forgot to provide a file name like …/myFile.png
Taifun