As a „By-Product“ of the Dead-Drop development i decided to publish some Code here, that might be helpful for others as snippets or usable classes.
The first one is a Delphi Class for a cross Platform FilePicker. In general the default TOpenDialog component can do the job easly. But while this component does not work under Android. My Class might help you if you are doing Android or Cross Platform Development with Delphi.
Delphi Cross Platform File Picker – Sancho Fock Public Portal (simplecrypt.net)