To merge APK and OBB files for an Android app, follow these steps:
First, download both the APK file and the OBB file for the app you want to merge.
Install an archive manager app on your Android device, such as ZArchiver or RAR.
Open the archive manager app and locate the OBB file you downloaded. Extract the OBB file to a specific folder on your device.
Install the APK file for the app you want to merge. Do not open the app yet.
Using the file manager app, navigate to the folder where you extracted the OBB file in step 3.
Copy the entire folder containing the extracted OBB file.
Navigate to the folder where the APK file for the app is installed. It should be in the "Android" folder on your device's internal storage.
Paste the entire folder containing the OBB file into the folder where the APK file is installed.
Once the folder is copied, open the app and it should now run with the merged APK and OBB files.
Note: Some apps may require additional steps or modifications to work properly with merged APK and OBB files.