What is the maximum upload file size for iCloud?

yes as documented in the Link Léonie provided - it pays to open links and read them

What types of files can I store in iCloud Drive?

You can store any type of file in iCloud Drive, as long as it's 50GB or less in size and you don't exceed your iCloud storage limit. That means you can keep all of your work documents, school projects, presentations, and more up to date across all of your devices. Learn more about managing your iCloud storage.

You shouldn't store app folders, libraries, or .tmp files in iCloud Drive.

LN

has the file size increased with the latest IOS ?

Hi ..

You can upload any file size as long as there's enough iCloud storage available.

Open System Preferences > iCloud

Storage available at the bottom of that pane.

For iCloud Drive (right now only available with iOS 8) there is a file size limit of 15 GB.

You can store any type of file in iCloud Drive, as long as it's less than 15 GB in size.

See: iCloud Drive FAQ