In the Catalina beta, if an HTML file is sitting on the Desktop and I try to open it for rendering in Safari, Safari refuses. The same file opens just fine if it is sitting in my Home folder.
Is there a way I can defeat this unwanted "protection"?
Safari in Catalina doesn't open files from Desktop
In the end I had to give Safari full disk access. There is a security authorization pane for individual folders like the Desktop, but the Plus button there doesn't work so you can't actually give an application access to just that one folder.