1, open folder
After saving the file to the file management that comes with Apple's mobile phone, click Browse to open the saved folder.
2. Enter my iphone.
In the folder option, select Enter My iphone, which is the location where the file is saved.
3. Open the file menu.
Find the file to be compressed in my iphone and press and hold for 3 seconds to open the file menu.
4. Select Compression
When the menu opens, click Compress and wait for the compression to complete.