Hello!
To replace the file picker, check the FolderPicker:
https://learn.microsoft.com/en-us/dotnet/communitytoolkit/maui/essentials/folder-picker?tabs=android
To use the camera and gallery, use the media picker:
https://learn.microsoft.com/en-us/dotnet/maui/platform-integration/device-media/picker?tabs=android
To display items in row, user Datagrid, Collectionview or HorizontalLayout:
https://learn.microsoft.com/en-us/dotnet/maui/user-interface/layouts/grid
https://learn.microsoft.com/en-us/dotnet/maui/user-interface/layouts/horizontalstacklayout
https://learn.microsoft.com/en-us/dotnet/maui/user-interface/controls/collectionview/
Best Regards,
Leo Wagner de Souza.
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