Could you please confirm the option you are talking about.
Are you clicking on the signature box on PDF or on some other option?
It will be helpful if you can share the screenshot to understand it better.
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In the past when I clicked place signature, a grayed out version of my signature would appear and then I would place it where it needed to go on the document. Now when I click I get a message asking me to draw a signature box. I try to go through these steps but the signature that I scanned is not a digital file and I do not have the option to change the file type.
Sorry for the delay in response.
Could you please let us know the dot version of Adobe application and OS you are working on.
Please make sure the application is updated to the latest patch released.
Refer this help document to get information on updates: Release Notes | Adobe Acrobat, Reader
Let us know if it helps.