How to Fix the Not Enough Space Issue for Android Devices?
If there is not enough space in the target phone's internal storage to save the data from the source phone, you can follow the steps to fix this problem:
1. Go to Settings > Storage to check the internal storage in the target phone.
2. Move as many files in the internal storage as you can to your computer/SD card, to free up more space.
3. Transfer data again.