File picker not working

I followed this tutorial from @Taifun: App Inventor Tutorials and Examples: Pick a file | Pura Vida Apps
Those are my blocks:

I get my error text (“Could not find an app to open files”) although there are two apps installed to choose files (Pixel 4a): CX file explorer and the Google Files App (which I normally use). Does anyone have an idea why it is not working? Thanks!

Thanks a lot!

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