Choosing 'Select All' with all files selected will Deselect All files

Expected Behavior

Choosing 'Select All' when all files in a directory are already selected should keep all files selected. Alternatively, the 'Select All' option should change to 'Deselect All' when all files are already selected.

Actual Behavior

Choosing 'Select All' when all files in the directory are already selected results in all files being Deselected. This is the opposite of the command the user issued.

How to Reproduce

1. Launch Amaze File Manager 3.2.1 on Android 8.1.0
2. Click the 3 Vertical Dots icon at the very top right next to the Home icon
3. Select 'Select All'
4. Click the 3 Vertical Dots icon at the very top right next to the Home icon
5. Select 'Select All' again

Device: Pixel 2 XL
OS: Android 8.1.0
App Version: 3.2.1

Recording of the Bug