Thank you for your replies and suggestion. I repost my question in the community. 

I cannot find such a community from the URL you posted. Could you tell me the specific URL for that community?

I would like to know whether I can update my PDF file on a free account of Adobe Document Cloud (https://documentcloud.adobe.com/), as I do in a Google Drive. With Google Drive, I can update a PDF file by uploading the next version of the file with the same name as previously uploaded. Is that possi...