If you have an electronic copy of a Source (for example, a scanned or downloaded image or certificate, or a text document), you will find it helpful to link it to the associated Source (for Method 1) or Citation (for Method 2)
Scanned or downloaded document Image Files such as JPEG or PNG can be added in a similar fashion to photographs, but would typically be linked to the Media tab of Source Records
Right-click Copy & Paste and left/right-click Drag & Drop are standard features in all current versions of Windows, but are supported to varying degrees in different versions of Family Historian ()
Sources are an essential part of recording the results of your Genealogy research; they help you, and others, understand how you reached a particular conclusion — and where you might be mistaken