First, if you've just uploaded your report logo in the last few minutes and it's not displaying yet, please give it some time. It can take up to 10 minutes for the report logo to propagate and to display properly.
If it's been longer than that amount of time, or if your report logo is displaying improperly, then it's most likely an issue with the way that the file was converted to SVG.
In those cases, please message our support team and send a high resolution copy of your logo in it's original JPG/GIF/PNG format so that we can convert it to .SVG from our end.