Copy your own N64 game files to SD card or Internal Memory. A N64 game file (ROM file) is necessary to play a game.
For touchscreen control issues, try changing the button scale. For unplayable ROMs, try unzipping the ROM first or trying a different version of the ROM. To fix lag, try changing the video setting: Settings - Display - Rendered resolution. To fix graphiccal glitches, try changing the video plugin: Profiles - Select Profiles - Emulation profile. Edit Control Buttons: Profiles - Touchscreen - Copy - Rename - Edit. Resize Control Buttons: Settings - Touchscreen - Button scale. All Controls: Analog & Dpad & L+R+Z Button (Profiles - Select Profiles - Touchscreen profile - Everything: All Controls) Auto Screen orientation: Settings - Display - Screen orientation - Auto. Support android 5.0+ (suitable for android 9.0+).
