A new blog has 1,025 MB Space Allowed for file uploads.
You can see how much space you have used on the Dashboard:
This space can be increased by request. Contact the RM help desk via your Local Authority contact.
We recommend that you try to keep these requests to a minimum.
Often blogs ballon in size because owners upload large numbers of images files at high resolution. In Glow Blogs files are downsized to 1200pixels (unless you change the settings).
It may be worthwhile thinking about which images to display rather than uploading a large number. A few well chosen and captioned images may be of more interest that a huge gallery.