As a Roblox developer, it is currently impossible to search for images/models/audio/meshes at the toolbox in the group images/models/audio/meshes tabs.
Problem is it currently takes way to long to find your images or models inside from a group inside the toolbox. Because you have to scroll all the way down depending were it is located. What takes sometime a lot of time, time that you could use into other things.
If Roblox is able to address this issue, the solution is easy, a search bar to find everything since we and probally more people have named everything and would be easier to find the assets based on the name or keyword in the search bar. This will also improve the work flow, specially for UI Designers that work with group images.
Now
Solution
This is just how it could look like.
I have waited until the new toolbox update incase it would have been added to it. But it didn’t.