Tom, please HELP with that! I use your App actively!

[Painkiller675]

1. When I try to download maps from "https://a.tile.openstreetmap.org/{z}/{x}/{y}.png", I can download only zoom 10 (IN FACT IT IS 7 ZOOM with some bad tiles!). When I try to download 1,2,3,4,5,6,7,8 or 9 zooms, file .db doesn't work, BUT I open it in DB Browser and see that there're lots of norm 'blob' there and the file has a big capacity! Why there're lot's of norm tiles but it doesn't work? By the way, some columns may include "Tile is not exists" , "Access denied" etc. especially when I use googlemaps. How does it work? Mb Can I somehow download these tiles and make db artificially? I wanna work with offline-tiles ..
2. Can I use another formats instead db to download it faster?? Or mb I can convert them into db them somehow? If yes, then how?
3. Can I decrease the capacity of db-files? Zoom 10 has GBs!
   Thx in advance, your App is so cool !