SVG files are not displayed in the "previously uploaded image" section of blog posts (after you hit Insert Image).
To view current behaviour:
* Using an Admin user for Blogs, add SVG file types to the allowable file upload types in Blogs.
* Create a new blog post
* Insert Image by uploading an svg file from your PC
* Image is displayed in the blog post
* save/publish blog post
* create another blog post
* try to insert the same image by using the Insert Image button and try
to select the previously uploaded image again ("Add an image from your
recent photos") -> svg image is not shown here (only png, jpg, etc.)
The customer would like for SVG files to be viewable in this section, if possible.