I recently painted all of my interior doors and ran into some issues. I did the first few doors outside and the wind kicked up and blew some stuff onto the doors, when I took it off it bubbled the paint so I sanded the areas down that had problems.
Unfortunately, when I went to put on the next coat, you can see that the areas I sanded down are "lower" than the other areas (like when paint chips and you try to paint over it.)
How do I get around that? Do I keep putting more and more paint on, or do I use some sort of wood filler?
I think your best bet is to sand the edges of your depression to "feather edge" them. Then, painting over those smoothed edges should provide a smooth surface that won't show that there was a depression there.
As wet paint dries and the solvents evaporate from it, the film thickness shrinks considerably. So, when a paint is wet,you often can barely discern anything showing through the paint film, but as that film dries and shrinks, then everything shows through.