The year is 2025 and we still don't have the option to organize our files ourselves... frustrating!
A segmentation feature ("templates") was released (I believe, to meet this need) where it is possible to distinguish between icons, illustrations, shapes, colors. However, unfortunately, we were not given the autonomy to do this ourselves. In other words, this predefined segmentation of "icons, illustrations, shapes, colors" is only valid for public files that have been published in the community.
I've seen some people reporting here how horrible it is to deal with files in Figma when you are an agency or when you are working in a team, but in fact this lack of autonomy when managing files is also felt by a solo user like me who likes to switch between different types of icons, illustrations, mockups, 3D images, style guides, design systems, etc., but cannot do this easily because the files are scattered throughout the interface with filters of questionable quality.
Finally, my feature suggestion is clear. We need to be able to organize our files. And I will continue to push for this here in the community until this need is met.