The problem is you cannot send large multi0GB files, video files, from machine to machine. Apple does not have a viable safe, reliable virtual private networking app, the idea of mail drop is great, Apple have yet to realize we live in the 21st century. iCloud is not fit for purpose, it is a badly planned app.
MAC addressing is set for each machine, and for the most part cannot be changed, so knowing 2 fixed points, my MAC address, and the MAC address of the receiving party, as both are signed into a "iCloud-Transfer" app, the "iCloud-Transfer" app would be able to regulate transfer via the internet, manage best route policy, and to perform regular error checking via VPN FTP, so that the client and creative can share private material safely and reliably.
Most places that offer this, have bandwidth issues, or space issues, you pay per GB transfer and are hit and miss.. Apple has completely missed the boat in this regard..
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part 2-- For the love of fruit, Apple has not bought DropBox, and why??? What is stopping Apple from buying Akamai for example? The App stores work great, a great example of VPN FTP in action, you sign into the App Store, this is VPN, and the file transfers via FTP, no coding needed...
So why not take the power of App Store, I sign into "iCloud-Transfer", it looks like a naked App Store, select file to upload, then an email is sent via the "iCloud-Transfer" app to my client telling him a file is ready, a one time password is created, he clicks the link in the email, the download starts, and is controlled via "iCloud-Transfer" app. I would not mind paying for storage once off, if the client cannot download at the time of upload.
Yes I know icloud has this option, icloud is clumsy and not user friendly, "iCloud-Transfer" app allows for client per client separation, no need to create or remember passwords etc.