There are actually already a lot of great pictures of UFO's out there [0]. The problem is exactly as you said: because these are typically from ordinary people or organizations, people cry "I could do this with Photoshop!" (and that is probably the true origin for many of them). I know someone personally who has a pretty good quality photo, which isn't faked, and isn't a plane or drone or ball lightning, but I wouldn't expect to be able to convince a reasonably skeptical person on the internet about its validity. So you end up with the skeptics taking a No True Scotsman position, which is intellectually counter-productive.
So, we have this "phenomenon" which is clearly quite active on our planet, but which does not want to be identified, for whatever reasons. Perhaps the reason there are any sightings at all are because of the sheer volume of their activity, because they are exerting influence on events, or as a means of making a slow and gradual introduction. Is there a military cover-up of this information? Absolutely. The amount of secrecy around this for nearly 80 years is unparalleled. Is it because some general or defense contractor or masonic lodge really cares so much if people know that there is a greater intelligence here? Probably not. The disclosure of centralized, credible phenomenon-related information is likely driven entirely by the phenomenon itself. So even with this movement for transparency the last few years, I'm not optimistic about getting the truth anytime soon.
[0] https://www.reddit.com/r/ufo/comments/falwxl/here_are_a_bunc...