1. Find this apk file in the file manager.
2. Press and hold the file and select the rename or similar option.
3. Modify the file name and delete the suffix "1" to remove this suffix.
Please note that modifying the file suffix may change the way the file is opened. Please make sure that you know the required file type and that the corresponding application can open the file. If you are in doubt about the file type or opening method, please consult relevant professionals or consult relevant materials in time.