The file signature invalid

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• I have read the FAQ section, searched the open issues, and still think this is a new bug.

Describe the bug you encountered:

I've used Keypass2Android for many years on my Moto Z phone but just changed to a Samsung S22 Ultra. I installed a fresh copy of the app from the Playstore and copied the database from my desktop by USB but when I try to open it I get the file signature invalid error and suggesting the wrong file type or corrupt file but if I mount the phone on my desktop and browse to the file I can open the same file with the desktop app so the file is OK.
I have a possibly related problem trying to open a file on the phone from an sftp server. It finds the file on the server and I fill the password blank but I get an UnknownHostException

Describe what you expected to happen:

Open the database

What version of Keepass2Android are you using?

1.14-r1

Which version of Android are you on?

15

Start by reproducing the failure in Keepass2Android 1.14-r1 on Android 15 with a database copied by USB from the desktop, then compare it with opening the same file on desktop. Investigate the file signature invalid message and the possibly related SFTP UnknownHostException; done means the database opens successfully on the Samsung S22 Ultra.