I can’t upload Mac "packages" into my Online Photo Album.
We are sorry, but Mac "packages" (files having the extension .pkg, .app, .download, .apvault, etc.) cannot be uploaded into your Crawler.com Online Photo Album.
If you want to upload these types of files into your Online Photo Album, archive/compress the package with your favorite compression utility (such as gzip, Stuffit etc.), or just right-click the package and select Archive/Compress from the menu, and then upload the archive file.