

I think it has access through the system filepicker app, and I’m pretty sure that means it will only temporarily be granted access to read just the file you pick. You, the user, can see and select any and all the files on the screen, but in this case, the app that requested the file access can’t see the content of the filepicker app’s UI - if I’m not totally mistaken.
If someone can confirm this, please do!
A quick search lead me to these sites, which I guess will do the job, but I haven’t verified if they’re working or not. It seems at least some of them will add some public trackers to the magnet link, but, with DHT enabled in the client, I think it could also work without adding those.
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