PLT-3585 Added a timeout to the file upload overlay (#3656)

webapp/sass/layout/_post.scss

@@ -187,6 +187,7 @@ body.ios {
     font-weight: 600;
     height: 100%;
     left: 0;
+    pointer-events: none;
     position: absolute;
     text-align: center;
     top: 0;