Yes. But if it’s a photo and the more staffs there are, the harder it is to get a good picture. PlayScore works well using the device camera for music up to five or 6 staves, often more. But in difficult cases, you can always import a picture downloaded or captured using a scanner.

There is no limit to the number of staves in a system if the image is good, for example, in a good quality PDF score.  However playback quality may deteriorate above 12 staves or so.  MusicXML export is not affected.

If your score has transposing instruments, remember to set auto-transpose (cogwheel).  Please read the section on transposing instruments.