You can link a reference/footnote to an image. If you want greater interactivity, you can post the transcription (assuming it is transcribed) into the profile. If it is not transcribed, I encourage you to transcribe it. Most people won't bother to read an old handwritten document thoroughly, and you might not have fully understood it either (in my experience, based on transcribing many documents in which I found new information when I had to decipher every word).