To associate a file type with an app on Android, follow these steps:
1. Locate the file you wish to associate with an app. This could be a document, an image, a video, or any other file type.
2. Once you have located the file, tap and hold on it to bring up the options menu. From the menu, select "Open with" or "Share" depending on your device's interface.
3. A list of compatible apps will appear. If the app you want to associate with the file is listed, simply tap on it to open the file with that app.
4. If the desired app is not listed, tap on the "More" or "Explore" option to view additional apps. From the list that appears, select the app you want to use.
5. If the app you want is still not shown, tap on "Open with" or "Share" menu again, and then select "App info" or "All apps." This will bring up a list of all installed apps on your device.
6. Scroll through the list and find the app you want to associate with the file. Tap on the app, and you will be taken back to the "Open with" or "Share" menu.
7. From the menu, select the app you have chosen. You will now be able to open files of that type with your selected app by default.
It's worth noting that these steps may vary slightly depending on the Android device and version of the operating system you are using. However, the general process should remain similar, allowing you to associate file types with specific apps to suit your needs.