Hi carlosp72824139 ,
Could you please tell what device you have (Phone or Tablet) ?
What version of Acrobat reader do you have?
When you made changes to the file which is in the Document Cloud , it goes to the Outbox.
Could you please check if the file you made changes to is shown under Outbox ?
It might be possible that at the time when you were making changes to the file , you were not connected to the Internet and the changes were not saved to the Cloud.