Specific directories - How to pick a file?

Okay, so how do I tell a component to load a certain file? for example, upload specific audio from a specific directory?

upload ? from device to where, or from where to device ?
component ? which one do you want to tell ?

I was referring to uploading a file from the phone into the application. such as uploading an audio file to Exo Player, uploading an image…

it looks like the question is “how to pick a file”?
there are extensions around
File Picker Plus Extension by Andres Daniel (12 USD)
File Picker Extension by Deep Host
for the extensions directory see here App Inventor Extensions | Pura Vida Apps

and you also can use the activity starter together with a file manager app of your choice, for example like this App Inventor Tutorials and Examples: Pick a file | Pura Vida Apps



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