Sadly, Windows cannot handle files larger than 4 GiB via WebDAV. Since the virtual drive is currently based on WebDAV, no files larger than that can be encrypted using Windows Explorer.
That said, Cryptomator can easily handle much larger files if the vault is accessed using some better software, such as Cyberduck. Here is a guide on how to do that: Can I use alternative WebDAV clients?
We’re trying to work around this limitation by providing the virtual drive using some other technology than WebDAV in future versions. The progress is documented on GitHub
Update February 2022: The 4GiB limit only applies to WebDAV-mounted vaults on Windows. Instead of WebDAV, you can install two other virtual file system providers:
To understand it correctly:
When using the desktop app cryptomator, the vault is mounted via WebDAV from the application. Thats why FAT is shown as the file system? And thats why no files larger than 4 GiB can be copied to the mounted drive?
After some more testing time both apps (Cyberduck and Mountain duck) are awkward at best and unusable at worst for me, obviously built for a different use case.
It’s really unfortunate that you cannot copy 4gb files on windows normally.