First time users do not need to register an account to use Loop.gl. You can send your first file by entering your recipient's email, your email, and uploading your file. However, if you wish to engage in a conversation around the file you will be prompted to set up an account. As well, your recipient can download your file without registering. But if they want to respond to your file they too will need to set up an account. Now that your email has been recorded, any files you try to send after the first time will prompt a sign up message. To make a long story short, maybe you just want to sign up from the beginning.