I'm using a Windows Lumia 640XL Windows Phone.
Just recently it was finally updated because I needed enough storage space. After the update, my phone is almost full (while not having that many apps installed).
Now WhatsApp doesn't work anymore because it needs 100 MB of free space (why?).
My 'This device' is now using 7.28 GB out of 7.28 GB. I already moved all possible apps to the SD card. System & reserved is 4.36 GB and cannot be changed. Apps & Games is 2.71 GB.
Within Apps & Games, OneDrive is by far most using the most 656 MB). Going to advanced options, the Reset button is disabled, and no add-ons are installed.
I removed (most) onedrive offline files.
How can I reduce the storage of OneDrive? And how can I change the offline onedrive files to SD?