The larger issue is that the app stores are full of predators who are simply interested in stealing data and selling us ads. Actually finding useful apps is tough. For a long time I used ES File Explorer on android, a popular file browser, until I realized that the whole app is just lbuilt to scrape my data and show me ads. I now favor Ghost Commander, which only requires permissions to access my files and is GPLd; the latter seems to me the best indicator of not trying to fuck me over.