Update blob creation to handle Buffer inputs correctly in createFile (#269)

Author: mattt

lib/files.js

@@ -15,7 +15,11 @@ async function createFile(file, metadata = {}) {
     blob = file;
   } else if (Buffer.isBuffer(file)) {
     filename = `buffer_${Date.now()}`;
-    blob = new Blob(file, { type: "application/octet-stream" });
+    const bytes = new Uint8Array(file);
+    blob = new Blob([bytes], {
+      type: "application/octet-stream",
+      name: filename,
+    });
   } else {
     throw new Error("Invalid file argument, must be a Blob, File or Buffer");
   }