Registered Users
Registered users (those without special extra editing priveleges) have many free options for creating photo galleries. Some of these are listed here. They each have their own instructions (link afer logo) for how that particular gallery works. The Trail Conference has their own accounts on these and you can post on these or your own your own account.
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Flickr 
YouTube (photos - use link to create a video from photos).- YouTube (videos)
Pinterest
Facebook
Google+ (TC pages)- Google+ (Places)
- Your own website, if you have one.
Once you have generated your gallery, copy the URL and paste into comments or special fields provided on some forms, e.g. trail problem report form.
Lots of apps exist for smart phones to upload photos immediately, e.g. Instagram, Four Square
Website Editors
Galleries currently broken