So this is a bug in NGS. You can't filter for certain items in the Personal shop. Like I can make it so I only see 3-4 star items and see that there are weapons there, but if I actually filter for weapons nothing shows up.
For Weapon Camos, they only seem to apply to one weapon at a time despite the ability to equip it to multiple categories in original PSO2. (When you use one weapon camo for multiple weapon types.)