SYMPTOM:
In order to share a document via a URL, a user can click on the 'Share…' button in the Home menu of the Document editor as shown below:

A user can also force the document to open in Express mode when using the URL by appending the following parameter to the end of the URL.
¤tViewMedia=1

¤tViewMedia=1

CAUSE:
In order to use currentViewMedia=1 to make a document open in Express mode correctly, a matching value for the 'src' parameter must also be used in the URL obtained from the above steps. Therefore, just adding the parameter but keeping the original value of the src parameter, shown below, will cause this issue.
The following is the default value of the src parameter:
&src=Main.aspx.2048026
&src=Main.aspx.oivm.rwb.2048026

Afterward, the document opened from the URL will be in Express mode and will have interactivity.