Acrobat Pro DC Loses Signature Once Saved

Hello,

I'm trying to add a signature to a document, but once I attach the signature and save the document, the signature disappears. This is the path I've taken.

Go to Fill & Sign

Click “Sign” icon

Then "Add Signature"

Then click on "Image"

Select the signature image

Hit "Apply"

File > Save

Once it saves the file, the signature disappears. These are the particulars of the computer/software I'm using.

Dell computer

Windows 7 Enterprise

Adobe Acrobat Pro DC

2015 Release (Continuous) Version 2015.007.20033

Any ideas?