Yes, you can. Each property has a notes field, which allows you to enter any miscellaneous information, notes about the property's condition, or links to external websites or videos.
Open one of your properties and click the Property Description link from the menu on the left side:
Then scroll down to the Notes section and enter any information you'd like to save in the provided text box:
Tip: any links you add here will be hyperlinked (clickable) in the property reports.
Everything you enter in the notes field will be saved for later and can also be included in the property reports you create for this property. When creating reports, be sure to enable the Include Notes toggle in the report settings: