WordPress, by default, does not allow SVG file uploads as this XML-based file format can contain malicious code. It can be especially dangerous when downloaded from unknown/untrusted sources or by untrusted users.
How to enable SVG support
You can enable SVG uploads on a user role basis under Bricks > Settings > SVG Uploads (tab: General). Once enabled Bricks will try to sanitize any SVG file uploads.
It is important to note that no built-in SVG sanitizer has a 100% guarantee to remove all malicious code. You should therefore download SVG files only from trusted sources, and only enable SVG uploads for user roles that you trust to follow this rule.