Windows 10 Mobile Insider Update

[AgnishB]

Hello!
I am enrolled in the slow ring of the windows insider preview. I have a Lumia 640 . The internal storage available in it is 7.28 gb. To update, it requires 1.22 gb. I have removed all apps and documents I could have removed. Now only system does and the (uninstallable) Microsoft apps are left. How do i get the else required to update?
PS: The mail+ messaging shows it is using 103mb space. Can that be removed?

 

[AgnishB]

Im currently using 6.12 gb of 7.28 gb. It says i require 1.22 gb which comes around 6.06 gb. So i just need about 70 mb more space