Unfortunately SVGs are a special case. They should NOT be, but that’s how it is with RW right now. @1611mac has already pointed you towards the GraphicStack which will let you drag/drop SVGs. And it’s free!
That’s probably the best solution for you right now. At least 90% of the time I don’t drag/drop (regardless of file type), instead I provide a direct link to the image. This means warehousing the image: so if you know how to use an FTP app then you will be in good shape. If FTP means “flakey tomale pesto” to you, then use Graphic Stack.
Developers are inconsistent whether they include the ability to link to SVG files (another variation on warehousing).
I typically add an SVG by warehousing the image then using HTML code. I don’t remember the code, but I’ve put a template for it in Typinator (keyboard shortcut app) and when I type “,img” the following code is inserted into a Markdown or HTML stack:
<img src="fullURLhere" alt="text description here" width="100%" />
Now all I have to do is add the relevant details.
Hopefully SVG support will resemble JPG and PNG support at a future point, but it’s not there now and it’s a sore point. Sore mainly because SVGs are vastly superior to GIFs, PNGs, and JPGs for graphic design type images (logos, visual models, mind maps). And they are very scaleable (try scaling a JPG upwards and you’ll soon see “jaggies” in the image).