pdf chnges could not saved in adobe reader touch.

The program you are working and asking about is the READER version which as the name implies is the READER version and not the Full version that can create and make changes to a PDF file.

So any changes you are trying to make can not be saved as what you are using is only a Reader of PDF file.

If this is in error, IE you do have a Full Subscription to the Acrobat DC Full version then post that.

Your post is kind of void of the details of what you are really trying to do and what has happened.

Since your post clearly says you are working with the Reader version I am moving this conversation over to the Acrobat Reader forum.