Fix query param handling in file interface (#3977)

Fixes #3944

app/src/utils/add-query-to-path.ts

@@ -0,0 +1,9 @@
+export function addQueryToPath(path: string, query: Record<string, string>) {
+	const queryParams = [];
+
+	for (const [key, value] of Object.entries(query)) {
+		queryParams.push(`${key}=${value}`);
+	}
+
+	return path.includes('?') ? `${path}&${queryParams.join('&')}` : `${path}?${queryParams.join('&')}`;
+}