Alternative Solutions
- One-click installation of a conversion tool to convert HEIC files to PNG (tested and convenient, but the resulting PNG files are very large): GitHub - xRyul/obsidian-image-converter: ⚡️ Convert, compress, resize, annotate, markup, draw, crop, rotate, flip, align images directly in Obsidian. Drag-resize, rename with variables, batch process. WEBP, JPG, PNG, HEIC, TIF. · GitHub
- Download the free software XnView to convert HEIC files to PNG: XnView · Advanced Image Viewer & Photo Management Software | Free | XnView.com
Direct Solution
However, manual installation is required (not tested): GitHub - guoang/obsidian-heic-preview: Obsidian plugin for HEIC image preview on macOS using native sips conversion · GitHub