That's a very good point...most phones have HD quality cameras, and yet we now see less and less photos and film of supposed extraterrestrial craft.
If you ever watch TV shows about the existence of aliens, tatty docs and stuff, they tend to concentrate on the older footage and stories. Probably because the footage is so fuzzy and unclear you can claim anything you want. Plus, many of the witnesses are no longer around anyway.
With modern tech, its probably easier to determine what you are looking at because of the increase in quality...but they dont make programmes about that sort of thing, do they?