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Balázs Kovácsleft a comment
Tresorit Send is like a secure alternate to WeTransfer. I found the open notification very useful and it's great, that it's free. I also downloaded the Chrome extension. Pros: Super easy-to-use and secure thanks to encryption. Cons: Right now it's in beta.
Tresorit SendUltra-secure, end-to-end encrypted large file sharing.