Creative Cloud won't let me upload Cloud (.aic, .psdc, etcetera) files I reclaimed.

TL;DR - I need help uploading ".aic" files to my Cloud Files, but I get an error message "Filetype not supported". How can I solve this?

Here's the long story:

After deleting a user from our team and reclaiming his files I received a download link with two .zip files (Cloud Documents.zip and Libraries.zip) containg all of the files he stored in the Adobe Cloud.

I expanded the Cloud Documents.zip and because we work mainly with Illustrator, most of the files had the ".aic" extension, which stands for "Adobe Illustrator Cloud File". Now what I need to do is upload those files to my Adobe Cloud files, but I keep getting an error message "Filetype not supported".

I have tried uploading them to my Files Cloud from both http://assets.adobe.com/files and directly from the Creative Cloud app, but I keep getting the same message.

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Already tried these solutions, to no avail.

-Tried Adobe support but they are as helpful as a rock. 

-Renamed file extensioins from ".aic" to ".ai" but Illustrator won't read it, and trying to upload it will give me a "file is damaged" kinda error.

-Moved all the files to my synced files folder (on mac: user/Creative Cloud Files), and while I now can see the files listed on my synced files in http://assets.adobe.com/files (synced option), I can only: preview, rename, move or copy them.