Restricting Branding Uploads to Supported Image Formats

For the Application Logo and Sign In Image fields, the system restricts uploads to include only .jpg, .jpeg, .gif, and .webp formats. Unsupported file types such as .svg, .xml, .pdf, and .mp4 will be rejected.

Additionally, malformed images—where a supported file type is changed to an unsupported format (e.g., .png renamed to .svg) or an unsupported file type is modified to appear as a supported format (e.g., .svg renamed to .png)—will also be rejected. 

If such images are uploaded, an "Unsupported File Type" error will be displayed, and the user will be unable to save branding changes.  

The two screenshots below illustrate this functionality.