Original PDF Content Invisible

I opened a pdf, ran "Recognize Text" and then used the "Fill & Sign" features to populate information within the document.  Then, I received an error message in a dialog box (but can't remember what was stated in it).  When I saw this I clicked "Save" to prevent losing my content.  Unfortunately, when I reopened the document I could only see what I added from the Fill & Sign menu and nothing of the original content of the pdf prior to editing.

May someone please advise if it's possible to recover this content?