1. There are no &#x27;defined&#x27; users, so you can send as many files as you like.<p>2. File size limit is 100MB since I think that&#x27;s an ok limit (Open to any suggestions about this)<p>3. The multi-part answer to the multi-part question:<p>- Using AWS S3 for the actual file hosting.<p>- No the files aren&#x27;t encrypted but that sounds like a fabulous idea (Care to elaborate more on this?).<p>- Thirdly privacy, I&#x27;m not sure how to answer this, if you&#x27;re talking about other users accessing your files, then it&#x27;s hard since the file id is a random generated hash. I personally won&#x27;t go into S3 and snoop on people&#x27;s files. Any way I can have people trust me on this?