Joplin's v3.1.6 APK includes an armeabi-v7a folder, which should contain the 32-bit builds of native code:
Notes/follow-up questions:
- The
minSdkVersion for Joplin 3.1.6 is 23. This corresponds to Android 6.0.
- Where are you installing Joplin from?
- What error message are you getting?