Add additional logging

src/files.js

@@ -38,7 +38,11 @@ export async function fetchFileWithHeadersFromBaseUrl (path, baseUrl, version) {
     isJSFile(path) && getCSSDependenciesFor({ file: path.substr(1), version })
   ])
 
-  if (!response.ok) throw new NotFoundError(`Error fetching file: ${path}`)
+  if (!response.ok) {
+    if (response.status === 404) logger.trace(`[Files] "${path}" could not be found on "${baseUrl}". Responded with: ${response.status}`)
+    else logger.error(`[Files] Unexpected result from file retrieval "${path}" on "${baseUrl}", responded with: ${response.status}`)
+    throw new NotFoundError(`Error fetching file: ${path}`)
+  }
 
   const result = {
     body: await createFileBuffer(response, dependencies),