Just like oversize images in the panel (over 2000px w × h), SVG files display the same black box preview. The SVG is 28px × 24px and looks like:
In the Files View I see: 
(the PNG is oversize and I will be replacing it)
When viewing details: 
the panel reports the dimension of the art are 0px.
I am using this file as an example and test. I had a larger SVG in but it exceed the 2000px limit and I wanted to be sure it wasn’t that preventing preview) I also know this file does display in browsers correctly as you can see in the footer here (http://jonwhipple.com) –yeah I need to find a video without the stupid ad…
Does the Panel preview SVG? If so, maybe my file is malformed?
Any suggestions welcome.
I just tested with the new 2.1 beta and no problem there. What version of Kirby are you on?
@texnixe OK I updated to 2.1 and the preview shows. That’s great!
I note the following (not sure where to put these? here under Issues? on github?)
The the information field still doesn’t display dimensions:
The layering in the preview tile makes the SVG cover the text:
When browser viewport is really wide (1920px or more) the icons and labels are no longer centred and things look a bit goofy:
Only looked with Mac OS X 10.10.2, Safari 8.0.4 and Firefox 36.0.1
Thanks!
Yeah, true, I experience the same problem depending on svg. I’d post it as an issue on Github rather than here (see this post: How to get “zero” sorting in panel?).
Yikes, I never had this when implementing it 
I will check it out again with a bigger SVG and try to fix it.
Testing in 2.1 beta, it seems when an SVG is higher than a 1:1 ratio it sticks out of its container div.
Last year I used SVG icons on a big project, and pulled my hair because of viewbox issues, and I think the issue here is related.
For what its worth, I was able to fix it in this particular panel view with css by adding .file-preview img { max-height: 100% }.
(Only tested in Chrome and Safari so far)
Opened up a pull request for this, tho I am not too sure if that is a bug that got introduced through the RTL changes or they were aligned left all the time from the beginning: Adjust file options position after RTL by distantnative · Pull Request #419 · getkirby-v2/panel · GitHub
Thanks for all your help. I added SVG zero dimension and SVG overlap preview tile to github (issues #421 and #422). @distantnative should I add an issue about the icons + labels not centring even though you have a pull request in?