Document Cloud includes 2GB of free storage or 100GB of storage with Acrobat DC subscription.
With the exception of Adobe Send, the Document Cloud services allow you to upload and convert files that are up to 100MB.
Your connection speed to the Internet, and the complexity of the document you're converting (number of pages, content) affect how large a file you can convert. So, even files that are under the 100MB file-size limit may not convert if they are overly complex.
The file size limit for compress PDF is 500MB.
If you've exhausted your 100GB storage limit, you can continue to browse, download, and consume content from Document Cloud. However, if you use a feature that requires uploading content to Document Cloud, you'll see a notification that you're over your quota. For example,
Adobe Acrobat Sign use is not bound by storage quota. Users exceeding the storage quota will not experience any change in their ability to use Acrobat Sign to send or sign agreements.