Uploading Custom STEP Files
Assets – The Assets panel is where external files live, such as SVGs to use as custom symbols, or 3D models.
Source: Flux Schematic Inspector
Inspector
The Layout Inspector panel on the right side shows contextual information about the selected object. When nothing is selected, the inspector shows document-level information like the description, layout rules, and other properties.
To get started, talk to Flux or create a New Document.