Earlier quoted context omitted.
Up to 2GB https://wetransfer.com
Thank you. Do we trust them and their security approach? Genuine question - it was a major selling point to me that Mozilla were operating Firefox Send. I was happy to give some trust to them and their approach to encryption.
That said, the thing that apparently killed Mozilla Send (becoming a hub for spam and child abuse material) was much easier to handle. The last big project I was involved in was an automated photoDNA scanner to detect suspected child abuse material. It would pull in various lists of hashes of known bad material and flag any matches for manual verification by the department of the Dutch police that handles such things.