Does the 10 ft. Galvanized Steel Water Rain Diverter Drip Edge Flashing tend to catch debris such as small leaves, ball moss, and dirt?

Yes, it collects debris although wind and rain wash most off.

Yes, the 10 ft. Galvanized Steel Water Rain Diverter Drip Edge Flashing collects debris although wind and rain wash most off over time. Periodic cleaning may be needed especially if it is installed under a tree.