The message means the game is looking for this OBB file in your device’s storage ( Android/obb/com.rovio.angrybirdsepic/ ). If the file is missing, corrupt, or incorrectly named, the game hangs.
How to Fix the "Checking Expansion File" Error in Angry Birds Epic angry birds epic checking expansion file
On Android 11 or higher, you may need a third-party file manager like ZArchiver to access the Android/obb folder due to system restrictions. The message means the game is looking for